package com.company;

        import java.sql.SQLOutput;
        import java.util.Scanner;
        import java.math.RoundingMode;
        import java.text.DecimalFormat;

public class Main {

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

        char symbol1 = sc.next().charAt(0);
        //char symbol2 = sc.next().charAt(0);
        boolean b1, b2;
        b1 = Character.isUpperCase(symbol1);
        //b2 = Character.isUpperCase(symbol2);
        if (b1){
            System.out.println("upper-case");
        } else {
            System.out.println("lower-case");
        }


    }
}