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

Ex Input:
Sentence: 'a geoup of people on bicycles coming down a street'. Replace the letter 'i' with 'x' in the sentence.

Ex Output:
a geoup of people on bxcycles comxng down a street

Ex Input:
Sentence: 'a cat is watching a computer with a video of a cat'. Replace the letter 't' with 'a' in the sentence.

Ex Output:
a caa is waaching a compuaer wiah a video of a caa

Ex Input:
Sentence: 'tennis player wearing blue and white hitting a ball'. Replace the letter 'h' with 'l' in the sentence.

Ex Output:
tennis player wearing blue and wlite litting a ball