The given sentence contains a typo which could be one of the following four types: (1) swapped letters of a word e.g. 'niec' is a typo of the word 'nice'. (2) missing letter in a word e.g. 'nic' is a typo of the word 'nice'. (3) extra letter in a word e.g. 'nicce' is a typo of the word 'nice'. (4) replaced letter in a word e.g 'nicr' is a typo of the word 'nice'. You need to identify the typo in the given sentence. To do this, answer with the word containing the typo.

Ex Input:
A man wlaking down a street while talking on a cellphone.

Ex Output:
wlaking


Ex Input:
A yong child holds an umbrella while an adult pulls the sleigh.

Ex Output:
yong


Ex Input:
The colck is mounted to the pole inside the building.

Ex Output:

colck