import java.util.Scanner;

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

        String str;
        str = scanner.nextLine();
        char c = str.charAt(0);
        if (c >=65 && c <= 90) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String str;
        str = scanner.nextLine();
        char c = str.charAt(0);
        if (c >=65 && c <= 90) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} Main public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String str;
        str = scanner.nextLine();
        char c = str.charAt(0);
        if (c >=65 && c <= 90) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    } main {
        Scanner scanner = new Scanner(System.in);

        String str;
        str = scanner.nextLine();
        char c = str.charAt(0);
        if (c >=65 && c <= 90) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) String str; str str = scanner.nextLine() str scanner.nextLine() scanner.nextLine scanner char c = str.charAt(0); c str.charAt(0) str.charAt str 0 if (c >=65 && c <= 90) {
            System.out.println("A");
        } else {
            System.out.println("a");
        } c >=65 && c <= 90 c >=65 c 65 c <= 90 c 90 {
            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[] args args public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String str;
        str = scanner.nextLine();
        char c = str.charAt(0);
        if (c >=65 && c <= 90) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String str;
        str = scanner.nextLine();
        char c = str.charAt(0);
        if (c >=65 && c <= 90) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} Main
import java.util.Scanner;

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

        String str;
        str = scanner.nextLine();
        char c = str.charAt(0);
        if (c >=65 && c <= 90) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
}
