import java.util.Scanner;
public class Main {

	public static void main(String[] args) {



		Scanner scan = new Scanner(System.in);

		String chara = scan.nextLine();

		if(Character.isUpperCase(chara.charAt(0))) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		scan.close();

	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {



		Scanner scan = new Scanner(System.in);

		String chara = scan.nextLine();

		if(Character.isUpperCase(chara.charAt(0))) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		scan.close();

	}

} Main public static void main(String[] args) {



		Scanner scan = new Scanner(System.in);

		String chara = scan.nextLine();

		if(Character.isUpperCase(chara.charAt(0))) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		scan.close();

	} main {



		Scanner scan = new Scanner(System.in);

		String chara = scan.nextLine();

		if(Character.isUpperCase(chara.charAt(0))) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		scan.close();

	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String chara = scan.nextLine(); chara scan.nextLine() scan.nextLine scan if(Character.isUpperCase(chara.charAt(0))) {
			System.out.println("A");
		}else {
			System.out.println("a");
		} Character.isUpperCase(chara.charAt(0)) Character.isUpperCase Character chara.charAt(0) chara.charAt chara 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" scan.close() scan.close scan String[] args args public class Main {

	public static void main(String[] args) {



		Scanner scan = new Scanner(System.in);

		String chara = scan.nextLine();

		if(Character.isUpperCase(chara.charAt(0))) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		scan.close();

	}

} public class Main {

	public static void main(String[] args) {



		Scanner scan = new Scanner(System.in);

		String chara = scan.nextLine();

		if(Character.isUpperCase(chara.charAt(0))) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		scan.close();

	}

} Main
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {



		Scanner scan = new Scanner(System.in);

		String chara = scan.nextLine();

		if(Character.isUpperCase(chara.charAt(0))) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		scan.close();

	}

}
