import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner entrada = new Scanner(System.in);
        char letter= entrada.next().charAt(0);
        if (Character.isUpperCase(letter)){
            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 entrada = new Scanner(System.in);
        char letter= entrada.next().charAt(0);
        if (Character.isUpperCase(letter)){
            System.out.println("A");
        }else{
            System.out.println("a");
        }

    }
} Main public static void main(String[] args) {

        Scanner entrada = new Scanner(System.in);
        char letter= entrada.next().charAt(0);
        if (Character.isUpperCase(letter)){
            System.out.println("A");
        }else{
            System.out.println("a");
        }

    } main {

        Scanner entrada = new Scanner(System.in);
        char letter= entrada.next().charAt(0);
        if (Character.isUpperCase(letter)){
            System.out.println("A");
        }else{
            System.out.println("a");
        }

    } Scanner entrada = new Scanner(System.in); entrada new Scanner(System.in) char letter= entrada.next().charAt(0); letter entrada.next().charAt(0) entrada.next().charAt entrada.next() entrada.next entrada 0 if (Character.isUpperCase(letter)){
            System.out.println("A");
        }else{
            System.out.println("a");
        } Character.isUpperCase(letter) Character.isUpperCase Character letter {
            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 entrada = new Scanner(System.in);
        char letter= entrada.next().charAt(0);
        if (Character.isUpperCase(letter)){
            System.out.println("A");
        }else{
            System.out.println("a");
        }

    }
} public class Main {

    public static void main(String[] args) {

        Scanner entrada = new Scanner(System.in);
        char letter= entrada.next().charAt(0);
        if (Character.isUpperCase(letter)){
            System.out.println("A");
        }else{
            System.out.println("a");
        }

    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner entrada = new Scanner(System.in);
        char letter= entrada.next().charAt(0);
        if (Character.isUpperCase(letter)){
            System.out.println("A");
        }else{
            System.out.println("a");
        }

    }
}