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

Example Input: Sentence: 'a couple of kids with rackets on a court'. Replace the letter 'u' with 'd' in the sentence.
Example Output: a codple of kids with rackets on a codrt

Example Input: Sentence: 'a group of men sitting at a desk with lap top computers'. Replace the letter 'p' with 'z' in the sentence.
Example Output: a grouz of men sitting at a desk with laz toz comzuters

Example Input: Sentence: 'five people climbing up a snowy hill to snow ski'. Replace the letter 'm' with 'h' in the sentence.
Example Output:
five people clihbing up a snowy hill to snow ski