# -*- coding: UTF-8 -*-
s = raw_input("Введите строку:")
 
st = s.split(" ")
#print st
a = 0
b = len(st[0])
max_word = []
for i in st:
    if a <= len(i):
        max_word.append(i)
        if a > b:
            for x in max_word:
                max_word.pop(0)
                if a < len(x):
                    break
            b = a
        a = len(i)
for j in max_word:    
    print j

>>> text = 'a b cc ddd ee fff'
>>> chunks = sorted(text.split(' '), lambda a, b: cmp(len(a), len(b)))
>>> [x for x in chunks if len(x) == len(chunks[-1])]
['ddd', 'fff']

>>> text = 'a b cc ddd ee fff'
>>> chunks = text.split(' ')
>>> [x for x in chunks if len(x) == len(max(chunks))]
['ddd', 'fff']

s = "a bb ccc dd eee sf"
d = s.split(" ")
[x for x in d if len(x)==max(map(len, d))]

# -*- coding: UTF-8 -*-
s = raw_input("Введите строку:")
aon = ''
for x in [i for i in range(len(s)) if s[i] == s[i+1:i+2] and s[i] != s[i-1:i]]:
    if s[x] == '#':
        aon = aon[len(aon)-1:len(aon)] + aon
        continue
    aon = aon +s[x]
print aon