import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
      String α = scan.next();
      
      if(Character.isUpperCase(α.charAt(0)))
        System.out.println("A");
      else
        System.out.println("a");
    }
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
      String α = scan.next();
      
      if(Character.isUpperCase(α.charAt(0)))
        System.out.println("A");
      else
        System.out.println("a");
    }
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
      String α = scan.next();
      
      if(Character.isUpperCase(α.charAt(0)))
        System.out.println("A");
      else
        System.out.println("a");
    } main {
		Scanner scan = new Scanner(System.in);
      String α = scan.next();
      
      if(Character.isUpperCase(α.charAt(0)))
        System.out.println("A");
      else
        System.out.println("a");
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String α = scan.next(); α scan.next() scan.next scan if(Character.isUpperCase(α.charAt(0)))
        System.out.println("A");
      else
        System.out.println("a"); Character.isUpperCase(α.charAt(0)) Character.isUpperCase Character α.charAt(0) α.charAt α 0 System.out.println("A") System.out.println System.out System System.out "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 scan = new Scanner(System.in);
      String α = scan.next();
      
      if(Character.isUpperCase(α.charAt(0)))
        System.out.println("A");
      else
        System.out.println("a");
    }
} public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
      String α = scan.next();
      
      if(Character.isUpperCase(α.charAt(0)))
        System.out.println("A");
      else
        System.out.println("a");
    }
} Main
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
      String α = scan.next();
      
      if(Character.isUpperCase(α.charAt(0)))
        System.out.println("A");
      else
        System.out.println("a");
    }
}