import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        char c = br.readLine().charAt(0);

        br.close();

        bw.write(Character.isUpperCase(c) ? 'A' : 'a');

        bw.flush();

    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.BufferedWriter; BufferedWriter java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.OutputStreamWriter; OutputStreamWriter java.io public class Main {
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        char c = br.readLine().charAt(0);

        br.close();

        bw.write(Character.isUpperCase(c) ? 'A' : 'a');

        bw.flush();

    }
} Main public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        char c = br.readLine().charAt(0);

        br.close();

        bw.write(Character.isUpperCase(c) ? 'A' : 'a');

        bw.flush();

    } main {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        char c = br.readLine().charAt(0);

        br.close();

        bw.write(Character.isUpperCase(c) ? 'A' : 'a');

        bw.flush();

    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out)); bw new BufferedWriter(new OutputStreamWriter(System.out)) char c = br.readLine().charAt(0); c br.readLine().charAt(0) br.readLine().charAt br.readLine() br.readLine br 0 br.close() br.close br bw.write(Character.isUpperCase(c) ? 'A' : 'a') bw.write bw Character.isUpperCase(c) ? 'A' : 'a' Character.isUpperCase(c) Character.isUpperCase Character c 'A' 'a' bw.flush() bw.flush bw String[] args args public class Main {
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        char c = br.readLine().charAt(0);

        br.close();

        bw.write(Character.isUpperCase(c) ? 'A' : 'a');

        bw.flush();

    }
} public class Main {
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        char c = br.readLine().charAt(0);

        br.close();

        bw.write(Character.isUpperCase(c) ? 'A' : 'a');

        bw.flush();

    }
} Main
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        char c = br.readLine().charAt(0);

        br.close();

        bw.write(Character.isUpperCase(c) ? 'A' : 'a');

        bw.flush();

    }
}