def print_file_stats(filename):
    """
    Prints different statistics about the provided file
    :param filename: (str) the name of the file to provide stats on
    :return: (None)
    """
    file = open(filename, "r")

    longest = ""
    shortest = ""
    total_length = 0
    count = 0

    for line in file:
        line = line.strip()
        words = line.split()
        for word in words:
            if len(word) > len(longest):
                longest = word

            if shortest == "" or len(word) < len(shortest):
                shortest = word

            total_length += len(word)
            count += 1

    file.close()

    print("Number of words: " + str(count))
    print("Longest word: " + longest)
    print("Shortest word: " + shortest)
    print("Avg. word length: " + str(total_length / count))