import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println(Character.isUpperCase(sc.next().charAt(0)) ? "A" : "a");
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println(Character.isUpperCase(sc.next().charAt(0)) ? "A" : "a");
	}
} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println(Character.isUpperCase(sc.next().charAt(0)) ? "A" : "a");
	} main {

		Scanner sc = new Scanner(System.in);

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

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println(Character.isUpperCase(sc.next().charAt(0)) ? "A" : "a");
	}
} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println(Character.isUpperCase(sc.next().charAt(0)) ? "A" : "a");
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println(Character.isUpperCase(sc.next().charAt(0)) ? "A" : "a");
	}
}