

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		String x=scan.next();
		char[] y=x.toCharArray();
		if(y[0]>='A' && y[0]<='Z') {
			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 scan=new Scanner(System.in);
		String x=scan.next();
		char[] y=x.toCharArray();
		if(y[0]>='A' && y[0]<='Z') {
			System.out.println("A");
		}
		else {
			System.out.println("a");
		}
	}

} Main public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		String x=scan.next();
		char[] y=x.toCharArray();
		if(y[0]>='A' && y[0]<='Z') {
			System.out.println("A");
		}
		else {
			System.out.println("a");
		}
	} main {
		Scanner scan=new Scanner(System.in);
		String x=scan.next();
		char[] y=x.toCharArray();
		if(y[0]>='A' && y[0]<='Z') {
			System.out.println("A");
		}
		else {
			System.out.println("a");
		}
	} Scanner scan=new Scanner(System.in); scan new Scanner(System.in) String x=scan.next(); x scan.next() scan.next scan char[] y=x.toCharArray(); y x.toCharArray() x.toCharArray x if(y[0]>='A' && y[0]<='Z') {
			System.out.println("A");
		}
		else {
			System.out.println("a");
		} y[0]>='A' && y[0]<='Z' y[0]>='A' y[0] y 0 'A' y[0]<='Z' y[0] y 0 'Z' {
			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 scan=new Scanner(System.in);
		String x=scan.next();
		char[] y=x.toCharArray();
		if(y[0]>='A' && y[0]<='Z') {
			System.out.println("A");
		}
		else {
			System.out.println("a");
		}
	}

} public class Main {

	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		String x=scan.next();
		char[] y=x.toCharArray();
		if(y[0]>='A' && y[0]<='Z') {
			System.out.println("A");
		}
		else {
			System.out.println("a");
		}
	}

} Main


import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		String x=scan.next();
		char[] y=x.toCharArray();
		if(y[0]>='A' && y[0]<='Z') {
			System.out.println("A");
		}
		else {
			System.out.println("a");
		}
	}

}
