import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        String temp = n.toUpperCase();
        if (n.equals(temp)) {
            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 sc = new Scanner(System.in);
        String n = sc.next();
        String temp = n.toUpperCase();
        if (n.equals(temp)) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        String temp = n.toUpperCase();
        if (n.equals(temp)) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        String temp = n.toUpperCase();
        if (n.equals(temp)) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String n = sc.next(); n sc.next() sc.next sc String temp = n.toUpperCase(); temp n.toUpperCase() n.toUpperCase n if (n.equals(temp)) {
            System.out.println("A");
        } else {
            System.out.println("a");
        } n.equals(temp) n.equals n temp {
            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 sc = new Scanner(System.in);
        String n = sc.next();
        String temp = n.toUpperCase();
        if (n.equals(temp)) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        String temp = n.toUpperCase();
        if (n.equals(temp)) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        String temp = n.toUpperCase();
        if (n.equals(temp)) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
    }
}
