Still can't tell the reason why this code failed 1 test case

Question

num_words ={'0':'zero','1':'one','2':'two','3':'three','4':'four','5':'five','6':'six','7':'seven','8':'eight','9':'nine','10':'ten'}
phrase = input()
new_phrase =''
for i in phrase:
if i in num_words.keys():
new_phrase +=num_words[i]
else:
new_phrase +=i
print(new_phrase )

Answer 1

Victor Uwemedimo George ,

> the problem with this code is that it compares the input string character by character against the dictionary keys, this does not work correct in all cases.

> to fix this issue, we can split the input string into words (at spaces positions), then check each word against the dictionary by using a loop.

> it is also better to build the new phrase as a list of words and join them at the end with spaces.

Answer 2

Enter "10 bees". Your code will output "onezero bees".

Answer 3

thanks a lot