import java.util.*;

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

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