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

Example Input: Sentence: 'people walk through a local fruit market in a city'. Replace the letter 'e' with 'n' in the sentence.
Example Output: pnopln walk through a local fruit marknt in a city

Example Input: Sentence: 'a woman is playing tennis on the tennis court'. Replace the letter 'r' with 'z' in the sentence.
Example Output: a woman is playing tennis on the tennis couzt

Example Input: Sentence: 'a vase filled with flowers on top of a table'. Replace the letter 'l' with 'n' in the sentence.
Example Output:
a vase finned with fnowers on top of a tabne