import sys

def main():
    args = sys.argv[1:]
    if len(args) != 1:
        sys.err.write("Expecting a single argument, got {!r}\n".format(args))
        sys.exit(1)

    input_file = args[0]

    # Read file into a string
    f = open(input_file, 'r')
    contents = open(input_file, 'r').read()
    print(contents)

    # Split file into words
def word_array(contents):
    words = []
    i = 0
    start_word_index = -1
    while True:
        if i >= len(contents):
            break
        curr_is_space = contents[i] == ' ' and (contents[i-1] != '.') and (contents[i-1] != ',') and (contents[i-1] != '!') and (contents[i-1] != '?')
        curr_is_letter = (contents[i] != ' ') and (contents[i] != '.') and (contents[i] != ',') and (contents[i] != '!') and (contents[i] != '?')
        curr_is_puncuation = (contents[i] == '.') or (contents[i] == ',') or (contents[i] == '!') or (contents[i] == '?')
        if curr_is_letter and start_word_index == -1:
            start_word_index = i
        elif curr_is_space and start_word_index != -1:
            words.append(contents[start_word_index:i])
            start_word_index = -1
        elif curr_is_puncuation and start_word_index != -1:
            words.append(contents[start_word_index:(i)])
            start_word_index = -1
        i = i + 1

    if start_word_index != -1:
        words.append(contents[start_word_index:])
    return words
    # Calculate frequencies

    # Generate new sentences

if __name__ == '__main__':
    main()