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

Example Input: Sentence: 'two cats sitting on an office chair next to a desk'. Replace the letter 's' with 'j' in the sentence.
Example Output: two catj jitting on an office chair next to a dejk

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: 'a woman holding a baby wrapped in a towel and brushing the baby's teeth in a bathroom'. Replace the letter 'b' with 'f' in the sentence.
Example Output:
a woman holding a fafy wrapped in a towel and frushing the fafy's teeth in a fathroom