import java.util.Scanner;

/**
 * <p>ClassName:  </p>
 * <p>Description: </p>
 * <p>Company: </p>
 *
 * @author zhangyong
 * @version 1.0.0
 * @date 2020/6/24 20:46
 */
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        Character a=str.charAt(0);
        if (a.charValue()>='A'&&a.charValue()<='Z'){
            System.out.println('A');
        }else if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        Character a=str.charAt(0);
        if (a.charValue()>='A'&&a.charValue()<='Z'){
            System.out.println('A');
        }else if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        }
    }
} Main public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        Character a=str.charAt(0);
        if (a.charValue()>='A'&&a.charValue()<='Z'){
            System.out.println('A');
        }else if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        }
    } main {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        Character a=str.charAt(0);
        if (a.charValue()>='A'&&a.charValue()<='Z'){
            System.out.println('A');
        }else if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        }
    } Scanner in = new Scanner(System.in); in new Scanner(System.in) String str = in.nextLine(); str in.nextLine() in.nextLine in Character a=str.charAt(0); a str.charAt(0) str.charAt str 0 if (a.charValue()>='A'&&a.charValue()<='Z'){
            System.out.println('A');
        }else if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        } a.charValue()>='A'&&a.charValue()<='Z' a.charValue()>='A' a.charValue() a.charValue a 'A' a.charValue()<='Z' a.charValue() a.charValue a 'Z' {
            System.out.println('A');
        } System.out.println('A') System.out.println System.out System System.out 'A' if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        } a.charValue()>='a'&&a.charValue()<='z' a.charValue()>='a' a.charValue() a.charValue a 'a' a.charValue()<='z' a.charValue() a.charValue a 'z' {
            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 in = new Scanner(System.in);
        String str = in.nextLine();
        Character a=str.charAt(0);
        if (a.charValue()>='A'&&a.charValue()<='Z'){
            System.out.println('A');
        }else if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        Character a=str.charAt(0);
        if (a.charValue()>='A'&&a.charValue()<='Z'){
            System.out.println('A');
        }else if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        }
    }
} Main
import java.util.Scanner;

/**
 * <p>ClassName:  </p>
 * <p>Description: </p>
 * <p>Company: </p>
 *
 * @author zhangyong
 * @version 1.0.0
 * @date 2020/6/24 20:46
 */
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        Character a=str.charAt(0);
        if (a.charValue()>='A'&&a.charValue()<='Z'){
            System.out.println('A');
        }else if (a.charValue()>='a'&&a.charValue()<='z'){
            System.out.println('a');
        }
    }
}
