import java.util.Scanner;

public class Main {
    public static void main(String[] var0) {
        Scanner scanner = new Scanner(System.in);

        String alpha = scanner.next();

        if (Character.isUpperCase(alpha.charAt(0))) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] var0) {
        Scanner scanner = new Scanner(System.in);

        String alpha = scanner.next();

        if (Character.isUpperCase(alpha.charAt(0))) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} Main public static void main(String[] var0) {
        Scanner scanner = new Scanner(System.in);

        String alpha = scanner.next();

        if (Character.isUpperCase(alpha.charAt(0))) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    } main {
        Scanner scanner = new Scanner(System.in);

        String alpha = scanner.next();

        if (Character.isUpperCase(alpha.charAt(0))) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) String alpha = scanner.next(); alpha scanner.next() scanner.next scanner if (Character.isUpperCase(alpha.charAt(0))) {
            System.out.println("A");
        } else {
            System.out.println("a");
        } Character.isUpperCase(alpha.charAt(0)) Character.isUpperCase Character alpha.charAt(0) alpha.charAt alpha 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" String[] var0 var0 public class Main {
    public static void main(String[] var0) {
        Scanner scanner = new Scanner(System.in);

        String alpha = scanner.next();

        if (Character.isUpperCase(alpha.charAt(0))) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} public class Main {
    public static void main(String[] var0) {
        Scanner scanner = new Scanner(System.in);

        String alpha = scanner.next();

        if (Character.isUpperCase(alpha.charAt(0))) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] var0) {
        Scanner scanner = new Scanner(System.in);

        String alpha = scanner.next();

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