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

Sentence: 'a small train is on the tracks by a house'. Replace the letter 'l' with 'x' in the sentence.
a smaxx train is on the tracks by a house

Sentence: 'a bathroom with a tub connected to a pool with some sinks inside'. Replace the letter 'e' with 'b' in the sentence.
a bathroom with a tub connbctbd to a pool with somb sinks insidb

Sentence: 'a man stands in front of piles of vegetables at a market'. Replace the letter 'n' with 'c' in the sentence.

a mac stacds ic froct of piles of vegetables at a market