1def beginning(word):
 2    length = len(word)
 3    num = length % 3
 4    if num == 0 or num == 1:
 5        return word[:int(length / 3)]
 6    else:
 7        return word[:int(length / 3 + 1)]
 8
 9def middle(word):
10    length = len(word)
11    if length % 3 == 0:
12        return word[int(length / 3):int((length / 3) * 2)]
13    elif length % 3 == 2:
14        return word[int(length / 3 + 1):int(length / 3  + length / 3)]
15    else:
16        return word[int(length / 3):int((length / 3) * 2 + 1)]
17
18
19def end(word):
20    length = len(word)
21    if length % 3 == 0:
22        return word[int((length / 3) * 2):]
23    elif length%3==1:
24        return word[int((length / 3) * 2 )+1:]
25    else:
26        return word[int((length / 3) * 2 ):]
27
28def split_sentence(sentence):
29    words=sentence.split()
30    result=[]
31    for word in words:
32        result.append((beginning(word),middle(word),end(word)))
33    return result