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

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: 'a white plate topped with a cut in half sandwich'. Replace the letter 'o' with 'x' in the sentence.

Ex Output:
a white plate txpped with a cut in half sandwich


Ex Input:
Sentence: 'man working in a restaurant kitchen cutting a pizza'. Replace the letter 'n' with 't' in the sentence.

Ex Output:

mat workitg it a restauratt kitchet cuttitg a pizza