import java.util.*;

public class Main{

    public static void main(String args[]){

        Scanner sc = new Scanner(System.in);
        String str = "";

        str = sc.next();

        if (Character.isUpperCase( str.charAt( 0 ))){
            System.out.println('A');
        }else{
            System.out.println('a');
        }
    }
}
 import java.util.*; util.* java public class Main{

    public static void main(String args[]){

        Scanner sc = new Scanner(System.in);
        String str = "";

        str = sc.next();

        if (Character.isUpperCase( str.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 str = "";

        str = sc.next();

        if (Character.isUpperCase( str.charAt( 0 ))){
            System.out.println('A');
        }else{
            System.out.println('a');
        }
    } main {

        Scanner sc = new Scanner(System.in);
        String str = "";

        str = sc.next();

        if (Character.isUpperCase( str.charAt( 0 ))){
            System.out.println('A');
        }else{
            System.out.println('a');
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String str = ""; str "" str = sc.next() str sc.next() sc.next sc 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 sc = new Scanner(System.in);
        String str = "";

        str = sc.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 sc = new Scanner(System.in);
        String str = "";

        str = sc.next();

        if (Character.isUpperCase( str.charAt( 0 ))){
            System.out.println('A');
        }else{
            System.out.println('a');
        }
    }
} Main
import java.util.*;

public class Main{

    public static void main(String args[]){

        Scanner sc = new Scanner(System.in);
        String str = "";

        str = sc.next();

        if (Character.isUpperCase( str.charAt( 0 ))){
            System.out.println('A');
        }else{
            System.out.println('a');
        }
    }
}

