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

Example Input: Sentence: 'he is making a meal on the boat and the man behind is getting out chopsticks and the other one is sitting'. Replace the letter 'e' with 'j' in the sentence.
Example Output: hj is making a mjal on thj boat and thj man bjhind is gjtting out chopsticks and thj othjr onj is sitting

Example Input: Sentence: 'four people are playing an interesting game in the park'. Replace the letter 'e' with 'x' in the sentence.
Example Output: four pxoplx arx playing an intxrxsting gamx in thx park

Example Input: Sentence: 'a stop sign hanging from a small shack'. Replace the letter 'a' with 's' in the sentence.
Example Output:
s stop sign hsnging from s smsll shsck