import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    String input = sc.nextLine();
		char a = input.charAt(0);
	    System.out.println(Character.isUpperCase(a) ? "A" : "a");
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    String input = sc.nextLine();
		char a = input.charAt(0);
	    System.out.println(Character.isUpperCase(a) ? "A" : "a");
	}
} Main public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    String input = sc.nextLine();
		char a = input.charAt(0);
	    System.out.println(Character.isUpperCase(a) ? "A" : "a");
	} main {
	    Scanner sc = new Scanner(System.in);
	    String input = sc.nextLine();
		char a = input.charAt(0);
	    System.out.println(Character.isUpperCase(a) ? "A" : "a");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String input = sc.nextLine(); input sc.nextLine() sc.nextLine sc char a = input.charAt(0); a input.charAt(0) input.charAt input 0 System.out.println(Character.isUpperCase(a) ? "A" : "a") System.out.println System.out System System.out Character.isUpperCase(a) ? "A" : "a" Character.isUpperCase(a) Character.isUpperCase Character a "A" "a" String[] args args public class Main {
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    String input = sc.nextLine();
		char a = input.charAt(0);
	    System.out.println(Character.isUpperCase(a) ? "A" : "a");
	}
} public class Main {
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    String input = sc.nextLine();
		char a = input.charAt(0);
	    System.out.println(Character.isUpperCase(a) ? "A" : "a");
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    String input = sc.nextLine();
		char a = input.charAt(0);
	    System.out.println(Character.isUpperCase(a) ? "A" : "a");
	}
}
