#main method
def main():
    filename = input('Enter filename: ')
    file = open(filename)
    longest_word = ''
    for line in file:
        line = line.strip()
        if len(line)>0:
            if longest_word is None or len(line)>len(longest_word):
                longest_word = line
    file.close()
    if longest_word is not None:
        print("Longest word is" ,"'" + longest_word + "'", "of length ", len(longest_word))

main()