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

Example Input: Sentence: 'a person holding a small remote key chain'. Replace the letter 'n' with 'j' in the sentence.
Example Output: a persoj holdijg a small remote key chaij

Example Input: Sentence: 'a man eats food that is inside a banana peel'. Replace the letter 'n' with 'k' in the sentence.
Example Output: a mak eats food that is ikside a bakaka peel

Example Input: Sentence: 'a boy riding his skate board on an obstacle course'. Replace the letter 'e' with 'b' in the sentence.
Example Output:
a boy riding his skatb board on an obstaclb coursb