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

Example Input: Sentence: 'there is a piece of a cake on the plate and a cup of drink'. Replace the letter 'r' with 'u' in the sentence.
Example Output: theue is a piece of a cake on the plate and a cup of duink

Example Input: Sentence: 'a man sitting on a luggage cart inside of an airport'. Replace the letter 't' with 'a' in the sentence.
Example Output: a man siaaing on a luggage cara inside of an airpora

Example Input: Sentence: 'two men dressed up with suit and tie standing in a parking lot'. Replace the letter 'i' with 'g' in the sentence.
Example Output:
two men dressed up wgth sugt and tge standgng gn a parkgng lot