import java.util.Scanner;

public class Main {

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

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