/*
Programming challenge description:
Given any string as an input, spell it out in reverse order, lower-case it and separate each character by hyphen.

The output string should contain only letters and numbers. You should ignore all other non-alphanumeric characters.

Input:
Any string (eg: “butterfly”). You can assume that the input will never be null.

Output:
Reversed order of the input string (eg: "y-l-f-r-e-t-t-u-b")
*/


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;

public class Main {
  /**
   * Iterate through each line of input.
   */
  public static void main(String[] args) throws IOException {
    InputStreamReader reader = new InputStreamReader(System.in, StandardCharsets.UTF_8);
    BufferedReader in = new BufferedReader(reader);
    String line;
    while ((line = in.readLine()) != null) {
       Main.reverseSpell(line);
    }
  }

  public static void reverseSpell(String input) {
    char[] stringAsChars = input.toCharArray();
    String reversed = "";

    for(int i = stringAsChars.length - 1; i >= 0; i--) {
      char elem = stringAsChars[i];
      if(!isLetterOrDigit(elem))
        continue;

      elem = toLower(elem);

      if(i != 0)
        reversed += elem + "-";
      else
        reversed += elem;
    }

    System.out.println(reversed);
  }

  private static boolean isLetterOrDigit(char elem) {
    return Character.isLetterOrDigit(elem);
  }

  private static char toLower(char elem) {
    return Character.toLowerCase(elem);
  }
}