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

Ex Input:
Sentence: 'a horse in a country field with woods in the background'. Replace the letter 'a' with 'i' in the sentence.

Ex Output:
i horse in i country field with woods in the bickground


Ex Input:
Sentence: 'a male holding a baseball bat standing on a big white star'. Replace the letter 'a' with 'i' in the sentence.

Ex Output:
i mile holding i bisebill bit stinding on i big white stir


Ex Input:
Sentence: 'a man is standing at the base ball triangle with bat in tow'. Replace the letter 'n' with 'c' in the sentence.

Ex Output:

a mac is stacdicg at the base ball triacgle with bat ic tow