#!/usr/bin/python

import sys
import io


def extract_unique_values(input_string):
    # Split the input string by newline to get the list of entries
    input_list = input_string.strip().split("\n")

    # Extract values from each entry in the format $VALUE1 - $VALUE2
    values = [item.strip() for entry in input_list for item in entry.split("-")]

    # Remove duplicates by converting to a set and back to a list
    unique_values = list(set(values))

    # Sort the list
    sorted_values = sorted(unique_values)

    # Convert the list back to a comma-separated string
    output = ",".join(sorted_values)

    return output


def main():
    sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding="utf-8")
    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding="utf-8")
    # Read the input from standard input
    input_string = sys.stdin.read()

    # Extract unique values
    result = extract_unique_values(input_string)

    print(result)


if __name__ == "__main__":
    main()