import java.util.Scanner;

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

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