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

Example Input: Sentence: 'a well dressed man standing near his early bicycle'. Replace the letter 'e' with 'd' in the sentence.
Example Output: a wdll drdssdd man standing ndar his darly bicycld

Example Input: Sentence: 'a couple sits on a bench in the countryside'. Replace the letter 'y' with 'k' in the sentence.
Example Output: a couple sits on a bench in the countrkside

Example Input: Sentence: 'a mexican-style pizza sits on a plate with a knife and small cups of salsa and sour cream'. Replace the letter 'e' with 'd' in the sentence.
Example Output:
a mdxican-styld pizza sits on a platd with a knifd and small cups of salsa and sour crdam