import java.util.Scanner;

public class techModuleUpperToLower {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String lowOrUp = scanner.nextLine();

        boolean hasUppercase = !lowOrUp.equals(lowOrUp.toLowerCase());
        boolean hasLowercase = !lowOrUp.equals(lowOrUp.toUpperCase());

        if(hasUppercase)
            System.out.println("upper-case");
        if(hasLowercase)
            System.out.println("lower-case");
    }
}