In this task, you need to replace a letter in the sentence with another given letter.

Input: Consider Input: Sentence: 'a dog wearing a hat on top of it's head'. Replace the letter 'g' with 'o' in the sentence.

Output: a doo wearino a hat on top of it's head

Input: Consider Input: Sentence: 'a open entrance leading to a set of closed doors'. Replace the letter 'd' with 'f' in the sentence.

Output: a open entrance leafing to a set of closef foors

Input: Consider Input: Sentence: 'a couple of men playing a game of tennis'. Replace the letter 'n' with 'c' in the sentence.
Output: a couple of mec playicg a game of teccis