import java.util.Scanner;
//import java.util.Arrays;
public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		Character a = scan.next().charAt(0);
		System.out.println(a.isUpperCase(a) ? "A" : "a");
	}
} import java.util.Scanner; Scanner java.util public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		Character a = scan.next().charAt(0);
		System.out.println(a.isUpperCase(a) ? "A" : "a");
	}
} Main public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		Character a = scan.next().charAt(0);
		System.out.println(a.isUpperCase(a) ? "A" : "a");
	} main {
		Scanner scan = new Scanner(System.in);
		Character a = scan.next().charAt(0);
		System.out.println(a.isUpperCase(a) ? "A" : "a");
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) Character a = scan.next().charAt(0); a scan.next().charAt(0) scan.next().charAt scan.next() scan.next scan 0 System.out.println(a.isUpperCase(a) ? "A" : "a") System.out.println System.out System System.out a.isUpperCase(a) ? "A" : "a" a.isUpperCase(a) a.isUpperCase a a "A" "a" String[] args args public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		Character a = scan.next().charAt(0);
		System.out.println(a.isUpperCase(a) ? "A" : "a");
	}
} public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		Character a = scan.next().charAt(0);
		System.out.println(a.isUpperCase(a) ? "A" : "a");
	}
} Main
import java.util.Scanner;
//import java.util.Arrays;
public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		Character a = scan.next().charAt(0);
		System.out.println(a.isUpperCase(a) ? "A" : "a");
	}
}
