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

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 man rolling dough in the kitchen'. Replace the letter 'a' with 'e' in the sentence.
e men rolling dough in the kitchen

Sentence: 'a baseball player holding a bat in front of catcher and umpire'. Replace the letter 'i' with 'k' in the sentence.

a baseball player holdkng a bat kn front of catcher and umpkre