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.

Q: A tw tone green train is being shown in a street mirror.

A: tw
****
Q: Fouer people waiting for a ski lift up a mountain.

A: Fouer
****
Q: A royund urinal is shiny clean except for a fly sitting in there.

A:
royund
****