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

Example Input: Sentence: 'stone and white colored structure in front of white modern building'. Replace the letter 'r' with 'p' in the sentence.
Example Output: stone and white coloped stpuctupe in fpont of white modepn building

Example Input: Sentence: 'a gate with a stop sign blocking the road'. Replace the letter 'h' with 'y' in the sentence.
Example Output: a gate wity a stop sign blocking tye road

Example Input: Sentence: 'an air force plane at the airport ready to takeoff'. Replace the letter 'o' with 'd' in the sentence.
Example Output:
an air fdrce plane at the airpdrt ready td takedff