import java.io.CharArrayReader;
import java.lang.reflect.Array;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if(Character.isUpperCase(n.charAt(0)))System.out.println('A');
        else System.out.println('a');
    }
} import java.io.CharArrayReader; CharArrayReader java.io import java.lang.reflect.Array; Array java.lang.reflect import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if(Character.isUpperCase(n.charAt(0)))System.out.println('A');
        else System.out.println('a');
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if(Character.isUpperCase(n.charAt(0)))System.out.println('A');
        else System.out.println('a');
    } main {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if(Character.isUpperCase(n.charAt(0)))System.out.println('A');
        else System.out.println('a');
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String n = sc.next(); n sc.next() sc.next sc if(Character.isUpperCase(n.charAt(0)))System.out.println('A');
        else System.out.println('a'); Character.isUpperCase(n.charAt(0)) Character.isUpperCase Character n.charAt(0) n.charAt n 0 System.out.println('A') System.out.println System.out System System.out '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 sc = new Scanner(System.in);
        String n = sc.next();
        if(Character.isUpperCase(n.charAt(0)))System.out.println('A');
        else System.out.println('a');
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if(Character.isUpperCase(n.charAt(0)))System.out.println('A');
        else System.out.println('a');
    }
} Main
import java.io.CharArrayReader;
import java.lang.reflect.Array;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if(Character.isUpperCase(n.charAt(0)))System.out.println('A');
        else System.out.println('a');
    }
}
