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

Ex Input:
Sentence: 'a building has a clock on the top of it'. Replace the letter 'l' with 'x' in the sentence.

Ex Output:
a buixding has a cxock on the top of it

Ex Input:
Sentence: 'a red hydrant is sitting on the sidewalk in the city'. Replace the letter 'n' with 'r' in the sentence.

Ex Output:
a red hydrart is sittirg or the sidewalk ir the city

Ex Input:
Sentence: 'a group of skiers in action on a snowy hill'. Replace the letter 'e' with 'p' in the sentence.

Ex Output:
a group of skiprs in action on a snowy hill