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

Sentence: 'a couple of kids with rackets on a court'. Replace the letter 'u' with 'd' in the sentence.
a codple of kids with rackets on a codrt

Sentence: 'a red hydrant is sitting on the sidewalk in the city'. Replace the letter 'n' with 'r' in the sentence.
a red hydrart is sittirg or the sidewalk ir the city

Sentence: 'a skier with a blue helmet and red pants skis down a snowy path in front of pine trees that are heavy with snow'. Replace the letter 't' with 'a' in the sentence.

a skier wiah a blue helmea and red panas skis down a snowy paah in frona of pine arees ahaa are heavy wiah snow