import java.lang.Character;
import java.util.Scanner;

public class Main {

    static void solve(String s ) {
        char bruh = s.charAt(0);
        if(Character.isUpperCase(bruh)){
            System.out.println("A");
        } else System.out.println("a");

    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
            String input = in.next();
            solve(input);

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

    static void solve(String s ) {
        char bruh = s.charAt(0);
        if(Character.isUpperCase(bruh)){
            System.out.println("A");
        } else System.out.println("a");

    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
            String input = in.next();
            solve(input);

    }
} Main static void solve(String s ) {
        char bruh = s.charAt(0);
        if(Character.isUpperCase(bruh)){
            System.out.println("A");
        } else System.out.println("a");

    } solve {
        char bruh = s.charAt(0);
        if(Character.isUpperCase(bruh)){
            System.out.println("A");
        } else System.out.println("a");

    } char bruh = s.charAt(0); bruh s.charAt(0) s.charAt s 0 if(Character.isUpperCase(bruh)){
            System.out.println("A");
        } else System.out.println("a"); Character.isUpperCase(bruh) Character.isUpperCase Character bruh {
            System.out.println("A");
        } System.out.println("A") System.out.println System.out System System.out "A" System.out.println("a") System.out.println System.out System System.out "a" String s s public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
            String input = in.next();
            solve(input);

    } main {
        Scanner in = new Scanner(System.in);
            String input = in.next();
            solve(input);

    } Scanner in = new Scanner(System.in); in new Scanner(System.in) String input = in.next(); input in.next() in.next in solve(input) solve input String[] args args public class Main {

    static void solve(String s ) {
        char bruh = s.charAt(0);
        if(Character.isUpperCase(bruh)){
            System.out.println("A");
        } else System.out.println("a");

    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
            String input = in.next();
            solve(input);

    }
} public class Main {

    static void solve(String s ) {
        char bruh = s.charAt(0);
        if(Character.isUpperCase(bruh)){
            System.out.println("A");
        } else System.out.println("a");

    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
            String input = in.next();
            solve(input);

    }
} Main
import java.lang.Character;
import java.util.Scanner;

public class Main {

    static void solve(String s ) {
        char bruh = s.charAt(0);
        if(Character.isUpperCase(bruh)){
            System.out.println("A");
        } else System.out.println("a");

    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
            String input = in.next();
            solve(input);

    }
}