import java.util.*;

public class Main {

    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        System.out.print("");
        String str = scanner.nextLine();

        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 scanner = new Scanner(System.in);
        System.out.print("");
        String str = scanner.nextLine();

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

} Main public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        System.out.print("");
        String str = scanner.nextLine();

        if(Character.isUpperCase(str.charAt(0))){
            System.out.println("A");
        }else{
            System.out.println( "a" );
        }
    } main {
        Scanner scanner = new Scanner(System.in);
        System.out.print("");
        String str = scanner.nextLine();

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

        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 scanner = new Scanner(System.in);
        System.out.print("");
        String str = scanner.nextLine();

        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 scanner = new Scanner(System.in);
        System.out.print("");
        String str = scanner.nextLine();

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

}
