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

public class Main {
    public static void main(String[] args) {
        FastReader f = new FastReader();
        String line = f.nextLine();
        StringBuilder sb = new StringBuilder();

        for (char ch : line.toCharArray()) {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        }
        System.out.println(sb);

    }

    // Helper class to speed up IO
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}
 import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
    public static void main(String[] args) {
        FastReader f = new FastReader();
        String line = f.nextLine();
        StringBuilder sb = new StringBuilder();

        for (char ch : line.toCharArray()) {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        }
        System.out.println(sb);

    }

    // Helper class to speed up IO
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
} Main public static void main(String[] args) {
        FastReader f = new FastReader();
        String line = f.nextLine();
        StringBuilder sb = new StringBuilder();

        for (char ch : line.toCharArray()) {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        }
        System.out.println(sb);

    } main {
        FastReader f = new FastReader();
        String line = f.nextLine();
        StringBuilder sb = new StringBuilder();

        for (char ch : line.toCharArray()) {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        }
        System.out.println(sb);

    } FastReader f = new FastReader(); f new FastReader() String line = f.nextLine(); line f.nextLine() f.nextLine f StringBuilder sb = new StringBuilder(); sb new StringBuilder() for (char ch : line.toCharArray()) {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        } char ch line.toCharArray() line.toCharArray line {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        } {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        } if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            } !Character.isAlphabetic(ch) Character.isAlphabetic(ch) Character.isAlphabetic Character ch {
                sb.append(ch);
            } sb.append(ch) sb.append sb ch if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            } ch < 97 ch 97 {
                sb.append(Character.toChars(ch + 32));
            } sb.append(Character.toChars(ch + 32)) sb.append sb Character.toChars(ch + 32) Character.toChars Character ch + 32 ch 32 {
                sb.append(Character.toChars(ch - 32));
            } sb.append(Character.toChars(ch - 32)) sb.append sb Character.toChars(ch - 32) Character.toChars Character ch - 32 ch 32 System.out.println(sb) System.out.println System.out System System.out sb String[] args args static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    } FastReader BufferedReader br; br StringTokenizer st; st public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        } FastReader {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        } br = new BufferedReader(new
                    InputStreamReader(System.in)) br new BufferedReader(new
                    InputStreamReader(System.in)) String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } next {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } IOException e {
                    e.printStackTrace();
                } e.printStackTrace() e.printStackTrace e {
                    st = new StringTokenizer(br.readLine());
                } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
            return Integer.parseInt(next());
        } nextInt {
            return Integer.parseInt(next());
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
            return Long.parseLong(next());
        } nextLong {
            return Long.parseLong(next());
        } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
            return Double.parseDouble(next());
        } nextDouble {
            return Double.parseDouble(next());
        } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        } nextLine {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        } String str = ""; str "" try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } IOException e {
                e.printStackTrace();
            } e.printStackTrace() e.printStackTrace e {
                str = br.readLine();
            } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main {
    public static void main(String[] args) {
        FastReader f = new FastReader();
        String line = f.nextLine();
        StringBuilder sb = new StringBuilder();

        for (char ch : line.toCharArray()) {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        }
        System.out.println(sb);

    }

    // Helper class to speed up IO
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
} public class Main {
    public static void main(String[] args) {
        FastReader f = new FastReader();
        String line = f.nextLine();
        StringBuilder sb = new StringBuilder();

        for (char ch : line.toCharArray()) {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        }
        System.out.println(sb);

    }

    // Helper class to speed up IO
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) {
        FastReader f = new FastReader();
        String line = f.nextLine();
        StringBuilder sb = new StringBuilder();

        for (char ch : line.toCharArray()) {
            if (!Character.isAlphabetic(ch)) {
                sb.append(ch);
            } else if (ch < 97) {
                sb.append(Character.toChars(ch + 32));
            } else {
                sb.append(Character.toChars(ch - 32));
            }
        }
        System.out.println(sb);

    }

    // Helper class to speed up IO
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}

