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: 'an umbrella sitting on top of a hill next to a body of water'. Replace the letter 't' with 'b' in the sentence.
Example Output: an umbrella sibbing on bop of a hill nexb bo a body of waber

Example Input: Sentence: 'a burger is stacked with tomatoes, onion, lettuce and a pickle on the side'. Replace the letter 'u' with 'q' in the sentence.
Example Output:
a bqrger is stacked with tomatoes, onion, lettqce and a pickle on the side