public class Main {
  public static void main(String[] args){
    String str = new java.util.Scanner(System.in).next();
    if (("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0) {
      System.out.println("A");
    } else {
      System.out.println("a");
    }
  }
} public class Main {
  public static void main(String[] args){
    String str = new java.util.Scanner(System.in).next();
    if (("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0) {
      System.out.println("A");
    } else {
      System.out.println("a");
    }
  }
} Main public static void main(String[] args){
    String str = new java.util.Scanner(System.in).next();
    if (("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0) {
      System.out.println("A");
    } else {
      System.out.println("a");
    }
  } main {
    String str = new java.util.Scanner(System.in).next();
    if (("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0) {
      System.out.println("A");
    } else {
      System.out.println("a");
    }
  } String str = new java.util.Scanner(System.in).next(); str new java.util.Scanner(System.in).next() new java.util.Scanner(System.in).next new java.util.Scanner(System.in) if (("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0) {
      System.out.println("A");
    } else {
      System.out.println("a");
    } ("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0 ("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) ("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf ("ABCDEFGHIJKLMNOPQRSTUVWXYZ") str 0 {
      System.out.println("A");
    } System.out.println("A") System.out.println System.out System System.out "A" {
      System.out.println("a");
    } System.out.println("a") System.out.println System.out System System.out "a" String[] args args public class Main {
  public static void main(String[] args){
    String str = new java.util.Scanner(System.in).next();
    if (("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0) {
      System.out.println("A");
    } else {
      System.out.println("a");
    }
  }
} public class Main {
  public static void main(String[] args){
    String str = new java.util.Scanner(System.in).next();
    if (("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0) {
      System.out.println("A");
    } else {
      System.out.println("a");
    }
  }
} Main
public class Main {
  public static void main(String[] args){
    String str = new java.util.Scanner(System.in).next();
    if (("ABCDEFGHIJKLMNOPQRSTUVWXYZ").indexOf(str) >= 0) {
      System.out.println("A");
    } else {
      System.out.println("a");
    }
  }
}