
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String a = s.nextLine();
        if(a.charAt(0)>='A'&&a.charAt(0)<='Z') System.out.println('A');
        else if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a');
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String a = s.nextLine();
        if(a.charAt(0)>='A'&&a.charAt(0)<='Z') System.out.println('A');
        else if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a');
    }
} Main public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String a = s.nextLine();
        if(a.charAt(0)>='A'&&a.charAt(0)<='Z') System.out.println('A');
        else if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a');
    } main {
        Scanner s = new Scanner(System.in);
        String a = s.nextLine();
        if(a.charAt(0)>='A'&&a.charAt(0)<='Z') System.out.println('A');
        else if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a');
    } Scanner s = new Scanner(System.in); s new Scanner(System.in) String a = s.nextLine(); a s.nextLine() s.nextLine s if(a.charAt(0)>='A'&&a.charAt(0)<='Z') System.out.println('A');
        else if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a'); a.charAt(0)>='A'&&a.charAt(0)<='Z' a.charAt(0)>='A' a.charAt(0) a.charAt a 0 'A' a.charAt(0)<='Z' a.charAt(0) a.charAt a 0 'Z' System.out.println('A') System.out.println System.out System System.out 'A' if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a'); a.charAt(0)>='a'&&a.charAt(0)<='z' a.charAt(0)>='a' a.charAt(0) a.charAt a 0 'a' a.charAt(0)<='z' a.charAt(0) a.charAt a 0 'z' 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 s = new Scanner(System.in);
        String a = s.nextLine();
        if(a.charAt(0)>='A'&&a.charAt(0)<='Z') System.out.println('A');
        else if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a');
    }
} public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String a = s.nextLine();
        if(a.charAt(0)>='A'&&a.charAt(0)<='Z') System.out.println('A');
        else if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a');
    }
} Main

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String a = s.nextLine();
        if(a.charAt(0)>='A'&&a.charAt(0)<='Z') System.out.println('A');
        else if(a.charAt(0)>='a'&&a.charAt(0)<='z') System.out.println('a');
    }
}
