import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
      String words = br2.readLine();
      int length = words.length();
      char[] converted = new char[length];
      
      for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      }
        
      for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      }
      
      out.print("\n");
//      End solve()
    }
//    End Solution
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }


  }

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.PrintWriter; PrintWriter java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
      String words = br2.readLine();
      int length = words.length();
      char[] converted = new char[length];
      
      for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      }
        
      for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      }
      
      out.print("\n");
//      End solve()
    }
//    End Solution
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }


  }

} Main static InputReader in; in static PrintWriter out; out public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
} main {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
} in = new InputReader(System.in) in new InputReader(System.in) out = new PrintWriter(System.out) out new PrintWriter(System.out) Solution solver = new Solution(); solver new Solution() solver.solve() solver.solve solver out.close() out.close out String[] args args static class Solution {
    void solve() throws IOException {
      BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
      String words = br2.readLine();
      int length = words.length();
      char[] converted = new char[length];
      
      for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      }
        
      for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      }
      
      out.print("\n");
//      End solve()
    }
//    End Solution
} Solution void solve() throws IOException {
      BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
      String words = br2.readLine();
      int length = words.length();
      char[] converted = new char[length];
      
      for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      }
        
      for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      }
      
      out.print("\n");
//      End solve()
    } solve {
      BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
      String words = br2.readLine();
      int length = words.length();
      char[] converted = new char[length];
      
      for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      }
        
      for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      }
      
      out.print("\n");
//      End solve()
    } BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in)); br2 new BufferedReader(new InputStreamReader(System.in)) String words = br2.readLine(); words br2.readLine() br2.readLine br2 int length = words.length(); length words.length() words.length words char[] converted = new char[length]; converted new char[length] length for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      } int i = 0; int i = 0; i 0 i < length i length i++ i++ i {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      } {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      } if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        } Character.isUpperCase(words.charAt(i)) Character.isUpperCase Character words.charAt(i) words.charAt words i {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } converted[i] = Character.toLowerCase(words.charAt(i)) converted[i] converted i Character.toLowerCase(words.charAt(i)) Character.toLowerCase Character words.charAt(i) words.charAt words i if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        } Character.isLowerCase(words.charAt(i)) Character.isLowerCase Character words.charAt(i) words.charAt words i {
          converted[i] = Character.toUpperCase(words.charAt(i));
        } converted[i] = Character.toUpperCase(words.charAt(i)) converted[i] converted i Character.toUpperCase(words.charAt(i)) Character.toUpperCase Character words.charAt(i) words.charAt words i {
          converted[i] = words.charAt(i);
        } converted[i] = words.charAt(i) converted[i] converted i words.charAt(i) words.charAt words i for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      } int i = 0; int i = 0; i 0 i < length i length i++ i++ i {
        out.print(converted[i]);
      } {
        out.print(converted[i]);
      } out.print(converted[i]) out.print out converted[i] converted i out.print("\n") out.print out "\n" static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }


  } InputReader public BufferedReader br; br public StringTokenizer st; st public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    } InputReader {
      br = new BufferedReader(new InputStreamReader(stream));
    } br = new BufferedReader(new InputStreamReader(stream)) br new BufferedReader(new InputStreamReader(stream)) InputStream stream stream public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    } nextInt {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    } while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      } st == null || !st.hasMoreTokens() st == null st null !st.hasMoreTokens() st.hasMoreTokens() st.hasMoreTokens st {
        st = new StringTokenizer(br.readLine());
      } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return Integer.parseInt(st.nextToken()); Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    } nextLong {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    } while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      } st == null || !st.hasMoreTokens() st == null st null !st.hasMoreTokens() st.hasMoreTokens() st.hasMoreTokens st {
        st = new StringTokenizer(br.readLine());
      } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return Long.parseLong(st.nextToken()); Long.parseLong(st.nextToken()) Long.parseLong Long st.nextToken() st.nextToken st public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    } next {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    } while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      } st == null || !st.hasMoreTokens() st == null st null !st.hasMoreTokens() st.hasMoreTokens() st.hasMoreTokens st {
        st = new StringTokenizer(br.readLine());
      } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    } nextDouble {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    } while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      } st == null || !st.hasMoreTokens() st == null st null !st.hasMoreTokens() st.hasMoreTokens() st.hasMoreTokens st {
        st = new StringTokenizer(br.readLine());
      } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return Double.parseDouble(st.nextToken()); Double.parseDouble(st.nextToken()) Double.parseDouble Double st.nextToken() st.nextToken st public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
      String words = br2.readLine();
      int length = words.length();
      char[] converted = new char[length];
      
      for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      }
        
      for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      }
      
      out.print("\n");
//      End solve()
    }
//    End Solution
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }


  }

} public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
      String words = br2.readLine();
      int length = words.length();
      char[] converted = new char[length];
      
      for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      }
        
      for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      }
      
      out.print("\n");
//      End solve()
    }
//    End Solution
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }


  }

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      BufferedReader br2 = new BufferedReader(new InputStreamReader(System.in));
      String words = br2.readLine();
      int length = words.length();
      char[] converted = new char[length];
      
      for (int i = 0; i < length; i++) {
        if (Character.isUpperCase(words.charAt(i))) {
          converted[i] = Character.toLowerCase(words.charAt(i));
        } else if (Character.isLowerCase(words.charAt(i))){
          converted[i] = Character.toUpperCase(words.charAt(i));
        } else {
          converted[i] = words.charAt(i);
        }
      }
        
      for (int i = 0; i < length; i++) {
        out.print(converted[i]);
      }
      
      out.print("\n");
//      End solve()
    }
//    End Solution
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }


  }

}