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

Example Input: Sentence: 'the kitchen has a big screen tv and a lot of counter space'. Replace the letter 'h' with 'z' in the sentence.
Example Output: tze kitczen zas a big screen tv and a lot of counter space

Example Input: Sentence: 'a bathroom that has  a sink and a toilet'. Replace the letter 's' with 'a' in the sentence.
Example Output: a bathroom that haa  a aink and a toilet

Example Input: Sentence: 'a man loads bananas high on top of a banana truck'. Replace the letter 'f' with 'c' in the sentence.
Example Output:
a man loads bananas high on top oc a banana truck