import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        
        Scanner scan = new Scanner(System.in);
        
        char c = scan.next().charAt(0);
        
        if (Character.isUpperCase(c)){
            System.out.println("A");
        }
        else{
            System.out.println("a");
        }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        
        Scanner scan = new Scanner(System.in);
        
        char c = scan.next().charAt(0);
        
        if (Character.isUpperCase(c)){
            System.out.println("A");
        }
        else{
            System.out.println("a");
        }
    }
} Main public static void main(String[] args) throws Exception {
        // Your code here!
        
        Scanner scan = new Scanner(System.in);
        
        char c = scan.next().charAt(0);
        
        if (Character.isUpperCase(c)){
            System.out.println("A");
        }
        else{
            System.out.println("a");
        }
    } main {
        // Your code here!
        
        Scanner scan = new Scanner(System.in);
        
        char c = scan.next().charAt(0);
        
        if (Character.isUpperCase(c)){
            System.out.println("A");
        }
        else{
            System.out.println("a");
        }
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) char c = scan.next().charAt(0); c scan.next().charAt(0) scan.next().charAt scan.next() scan.next scan 0 if (Character.isUpperCase(c)){
            System.out.println("A");
        }
        else{
            System.out.println("a");
        } Character.isUpperCase(c) Character.isUpperCase Character c {
            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) throws Exception {
        // Your code here!
        
        Scanner scan = new Scanner(System.in);
        
        char c = scan.next().charAt(0);
        
        if (Character.isUpperCase(c)){
            System.out.println("A");
        }
        else{
            System.out.println("a");
        }
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        
        Scanner scan = new Scanner(System.in);
        
        char c = scan.next().charAt(0);
        
        if (Character.isUpperCase(c)){
            System.out.println("A");
        }
        else{
            System.out.println("a");
        }
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        
        Scanner scan = new Scanner(System.in);
        
        char c = scan.next().charAt(0);
        
        if (Character.isUpperCase(c)){
            System.out.println("A");
        }
        else{
            System.out.println("a");
        }
    }
}
