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

Example Input: Sentence: 'a woman sitting along the body of water looking at her cell phone'. Replace the letter 'e' with 'b' in the sentence.
Example Output: a woman sitting along thb body of watbr looking at hbr cbll phonb

Example Input: Sentence: 'a woman gives a thumbs up sign while sitting in front of a sandwich'. Replace the letter 's' with 'h' in the sentence.
Example Output: a woman giveh a thumbh up hign while hitting in front of a handwich

Example Input: Sentence: 'a person standing in a kitchen in front of a refrigerator'. Replace the letter 'o' with 's' in the sentence.
Example Output:
a perssn standing in a kitchen in frsnt sf a refrigeratsr