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

Example Input: Sentence: 'a computer, keyboard, and mouse sitting on a desk'. Replace the letter 's' with 'c' in the sentence.
Example Output: a computer, keyboard, and mouce citting on a deck

Example Input: Sentence: 'a street light is near a large building'. Replace the letter 'n' with 'c' in the sentence.
Example Output: a street light is cear a large buildicg

Example Input: Sentence: 'six different pictures with six different choices of what you can eat'. Replace the letter 'o' with 'a' in the sentence.
Example Output:
six different pictures with six different chaices af what yau can eat