''' Purpose: find the word of the longest length amongst the input
'''

# get the words
reply = input( 'Enter a series of words: ' )
words = reply.split()

# need to keep track of the longest word seen so far. It's initialization
# should never prevent the word of longest length being missed

longest_word_seen_so_far = ''
# Or we can do the first word in the list, but if there are no words in the list
# the empty string is correct

# consider the words one by one

for word in words :
    # check the word out - compare its length to longest so far
    # if current word is longer than the longest word so far, need to update
    # print( 'word =', word, ': longest word =', longest_word_seen_so_far)
    len1 = len( word )
    len2 = len( longest_word_seen_so_far )
    if ( len1 > len2 ) :
        longest_word_seen_so_far = word

# longest word so far must be longest as considered every word as a possibility

# print longest word
print( longest_word_seen_so_far )

# all done


# Alternative solution

list_of_lens = []

for word in words:
    lenw = len( word )
    list_of_lens.append( lenw )

# list_of_lens is the individual word lengths
# print( 'list of lens', list_of_lens )

# the max length word
max_word_len = max( list_of_lens )
# print( 'max word len', max_word_len )

n = len( words )

# The ith word in words has the ith length in list_of_lens
# for i in range( 0, n):
#     print( words[i] , list_of_lens[i] )


index_of_longest_word_len = list_of_lens.index( max_word_len )
# print( 'index of longest word len', index_of_longest_word_len )

longest_word = words[ index_of_longest_word_len ]
print( longest_word )