1def beginning(str):
 2    if(len(str)%3 in [0, 1]):
 3        position = slice(0, len(str)//3)
 4        return str[position]
 5    elif(len(str)%3 == 2):
 6        position = slice(0, len(str)//3 + 1)
 7        return str[position]
 8
 9def middle(str):
10    if(len(str)%3 == 0):
11        start_index = (int)(len(str)/3)
12        position = slice(start_index, start_index*2)
13        return str[position]
14    elif(len(str)%3 == 1):
15        start_index = (int)(len(str)/3)
16        position = slice(start_index, start_index*2 + 1)
17        return str[position]
18    elif(len(str)%3 == 2):
19        start_index = (int)(len(str)/3) + 1
20        position = slice(start_index, start_index*2 - 1)
21        return str[position]
22    
23def end(str):
24    if(len(str)%3 == 0):
25        start_index = (int)(len(str)/3)*2
26        position = slice(start_index, len(str))
27        return str[position]
28    elif(len(str)%3 == 1):
29        start_index = (int)(len(str)/3)*2 +1
30        position = slice(start_index, len(str))
31        return str[position]
32    elif(len(str)%3 == 2):
33        start_index = (int)(len(str)/3)*2 + 1
34        position = slice(start_index, len(str))
35        return str[position]
36    
37def split_sentence(sentence):
38    result = []
39    for word in sentence.split(' '):
40        curr_word_tuple = (
41            beginning(word),
42            middle(word),
43            end(word)
44        )
45        result.append(curr_word_tuple)
46    return result
47
48#print(beginning('12'))
49#print(middle('12'))
50#print(end('12'))
51#print(split_sentence('Kazvam se Djon Snow'))