import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sn = new Scanner(System.in);
        String str = sn.next();
        if( Character.isUpperCase( str.charAt( 0 ) ) ) {
            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 sn = new Scanner(System.in);
        String str = sn.next();
        if( Character.isUpperCase( str.charAt( 0 ) ) ) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
	}
} Main public static void main(String[] args) {
		Scanner sn = new Scanner(System.in);
        String str = sn.next();
        if( Character.isUpperCase( str.charAt( 0 ) ) ) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
	} main {
		Scanner sn = new Scanner(System.in);
        String str = sn.next();
        if( Character.isUpperCase( str.charAt( 0 ) ) ) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
	} Scanner sn = new Scanner(System.in); sn new Scanner(System.in) String str = sn.next(); str sn.next() sn.next sn if( Character.isUpperCase( str.charAt( 0 ) ) ) {
            System.out.println("A");
        } else {
            System.out.println("a");
        } Character.isUpperCase( str.charAt( 0 ) ) Character.isUpperCase Character str.charAt( 0 ) str.charAt str 0 {
            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 sn = new Scanner(System.in);
        String str = sn.next();
        if( Character.isUpperCase( str.charAt( 0 ) ) ) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sn = new Scanner(System.in);
        String str = sn.next();
        if( Character.isUpperCase( str.charAt( 0 ) ) ) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
	}
} Main
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sn = new Scanner(System.in);
        String str = sn.next();
        if( Character.isUpperCase( str.charAt( 0 ) ) ) {
            System.out.println("A");
        } else {
            System.out.println("a");
        }
	}
}

