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

Ex Input:
Sentence: 'horses drink and graze the field and water'. Replace the letter 'i' with 'c' in the sentence.

Ex Output:
horses drcnk and graze the fceld and water

Ex Input:
Sentence: 'wooden park bench sitting between two trees with grassy background'. Replace the letter 'i' with 'q' in the sentence.

Ex Output:
wooden park bench sqttqng between two trees wqth grassy background

Ex Input:
Sentence: 'a dog sitting in the living room while watching a tv monitor'. Replace the letter 'n' with 'w' in the sentence.

Ex Output:
a dog sittiwg iw the liviwg room while watchiwg a tv mowitor