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

Example Input: Sentence: 'a woman walks by with a large suitcase and a polka dot umbrella'. Replace the letter 'e' with 'n' in the sentence.
Example Output: a woman walks by with a largn suitcasn and a polka dot umbrnlla

Example Input: Sentence: 'wooden park bench sitting between two trees with grassy background'. Replace the letter 'i' with 'q' in the sentence.
Example Output: wooden park bench sqttqng between two trees wqth grassy background

Example Input: Sentence: 'a little girl in the bed with two teddy bears'. Replace the letter 'e' with 'h' in the sentence.
Example Output:
a littlh girl in thh bhd with two thddy bhars