import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String a = br.readLine();
        System.out.println(problem171a(a));
    }

    private static String problem171a(String a) {
        return (a.equals(a.toLowerCase())) ? "a" : "A";
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String a = br.readLine();
        System.out.println(problem171a(a));
    }

    private static String problem171a(String a) {
        return (a.equals(a.toLowerCase())) ? "a" : "A";
    }
} Main public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String a = br.readLine();
        System.out.println(problem171a(a));
    } main {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String a = br.readLine();
        System.out.println(problem171a(a));
    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String a = br.readLine(); a br.readLine() br.readLine br System.out.println(problem171a(a)) System.out.println System.out System System.out problem171a(a) problem171a a String[] args args private static String problem171a(String a) {
        return (a.equals(a.toLowerCase())) ? "a" : "A";
    } problem171a {
        return (a.equals(a.toLowerCase())) ? "a" : "A";
    } return (a.equals(a.toLowerCase())) ? "a" : "A"; (a.equals(a.toLowerCase())) ? "a" : "A" (a.equals(a.toLowerCase())) a.equals a a.toLowerCase() a.toLowerCase a "a" "A" String a a public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String a = br.readLine();
        System.out.println(problem171a(a));
    }

    private static String problem171a(String a) {
        return (a.equals(a.toLowerCase())) ? "a" : "A";
    }
} public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String a = br.readLine();
        System.out.println(problem171a(a));
    }

    private static String problem171a(String a) {
        return (a.equals(a.toLowerCase())) ? "a" : "A";
    }
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String a = br.readLine();
        System.out.println(problem171a(a));
    }

    private static String problem171a(String a) {
        return (a.equals(a.toLowerCase())) ? "a" : "A";
    }
}