
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
import java.util.TreeSet;

public class Main {

	public static void main(String[] args) {

		Scanner inScanner = new Scanner(System.in);

	 
		String worString = inScanner.next();
		char d = worString.charAt(0);
		if (Character.isUpperCase(d)) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		
	}
} import java.util.ArrayList; ArrayList java.util import java.util.Arrays; Arrays java.util import java.util.Collections; Collections java.util import java.util.Scanner; Scanner java.util import java.util.TreeSet; TreeSet java.util public class Main {

	public static void main(String[] args) {

		Scanner inScanner = new Scanner(System.in);

	 
		String worString = inScanner.next();
		char d = worString.charAt(0);
		if (Character.isUpperCase(d)) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		
	}
} Main public static void main(String[] args) {

		Scanner inScanner = new Scanner(System.in);

	 
		String worString = inScanner.next();
		char d = worString.charAt(0);
		if (Character.isUpperCase(d)) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		
	} main {

		Scanner inScanner = new Scanner(System.in);

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

	 
		String worString = inScanner.next();
		char d = worString.charAt(0);
		if (Character.isUpperCase(d)) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		
	}
} public class Main {

	public static void main(String[] args) {

		Scanner inScanner = new Scanner(System.in);

	 
		String worString = inScanner.next();
		char d = worString.charAt(0);
		if (Character.isUpperCase(d)) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		
	}
} Main

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
import java.util.TreeSet;

public class Main {

	public static void main(String[] args) {

		Scanner inScanner = new Scanner(System.in);

	 
		String worString = inScanner.next();
		char d = worString.charAt(0);
		if (Character.isUpperCase(d)) {
			System.out.println("A");
		}else {
			System.out.println("a");
		}
		
	}
}