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

Example Input: Sentence: 'many people gathered on a sunny day flying kites'. Replace the letter 'e' with 'm' in the sentence.
Example Output: many pmoplm gathmrmd on a sunny day flying kitms

Example Input: Sentence: 'a man sitting in a chair with a laptop in his lap'. Replace the letter 'p' with 'v' in the sentence.
Example Output: a man sitting in a chair with a lavtov in his lav

Example Input: Sentence: 'a pizza on a table with garnish behind it'. Replace the letter 'z' with 'v' in the sentence.
Example Output:
a pivva on a table with garnish behind it