import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
		char s = S.charAt(0);

		System.out.println(Character.isUpperCase(s)?"A":"a");

	}

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

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
		char s = S.charAt(0);

		System.out.println(Character.isUpperCase(s)?"A":"a");

	}

} Main public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
		char s = S.charAt(0);

		System.out.println(Character.isUpperCase(s)?"A":"a");

	} main {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
		char s = S.charAt(0);

		System.out.println(Character.isUpperCase(s)?"A":"a");

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

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
		char s = S.charAt(0);

		System.out.println(Character.isUpperCase(s)?"A":"a");

	}

} public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
		char s = S.charAt(0);

		System.out.println(Character.isUpperCase(s)?"A":"a");

	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		String S = scanner.nextLine();
		char s = S.charAt(0);

		System.out.println(Character.isUpperCase(s)?"A":"a");

	}

}