

import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

public class Main {
    
    public static void main(String[] args) {
	// write your code here
        Scanner sc= new Scanner(System.in);
      String s= sc.next();

      if(Character.isUpperCase(s.charAt(0))){
          System.out.println('A');
      }
      else
          System.out.println('a');

    }
} import java.util.LinkedList; LinkedList java.util import java.util.Queue; Queue java.util import java.util.Scanner; Scanner java.util public class Main {
    
    public static void main(String[] args) {
	// write your code here
        Scanner sc= new Scanner(System.in);
      String s= sc.next();

      if(Character.isUpperCase(s.charAt(0))){
          System.out.println('A');
      }
      else
          System.out.println('a');

    }
} Main public static void main(String[] args) {
	// write your code here
        Scanner sc= new Scanner(System.in);
      String s= sc.next();

      if(Character.isUpperCase(s.charAt(0))){
          System.out.println('A');
      }
      else
          System.out.println('a');

    } main {
	// write your code here
        Scanner sc= new Scanner(System.in);
      String s= sc.next();

      if(Character.isUpperCase(s.charAt(0))){
          System.out.println('A');
      }
      else
          System.out.println('a');

    } Scanner sc= new Scanner(System.in); sc new Scanner(System.in) String s= sc.next(); s sc.next() sc.next sc if(Character.isUpperCase(s.charAt(0))){
          System.out.println('A');
      }
      else
          System.out.println('a'); Character.isUpperCase(s.charAt(0)) Character.isUpperCase Character s.charAt(0) s.charAt s 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 System.out System System.out 'a' String[] args args public class Main {
    
    public static void main(String[] args) {
	// write your code here
        Scanner sc= new Scanner(System.in);
      String s= sc.next();

      if(Character.isUpperCase(s.charAt(0))){
          System.out.println('A');
      }
      else
          System.out.println('a');

    }
} public class Main {
    
    public static void main(String[] args) {
	// write your code here
        Scanner sc= new Scanner(System.in);
      String s= sc.next();

      if(Character.isUpperCase(s.charAt(0))){
          System.out.println('A');
      }
      else
          System.out.println('a');

    }
} Main


import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

public class Main {
    
    public static void main(String[] args) {
	// write your code here
        Scanner sc= new Scanner(System.in);
      String s= sc.next();

      if(Character.isUpperCase(s.charAt(0))){
          System.out.println('A');
      }
      else
          System.out.println('a');

    }
}
