import java.util.Scanner;

public class FirstSample {

    public static void main(String[] args) {

        int x = 3;
        while (x>0) {
            if (x >2){
                System.out.print("a");
            }
            if (x == 2){
                System.out.print("b c");
            }
            if (x == 1) {
                System.out.print("d");
                x= x-1;
            }
            x= x -1;
            System.out.print("-");
        }
    }
}