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

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 man swinging at a tennis with a racquet on a court'. Replace the letter 't' with 'c' in the sentence.

Ex Output:
a man swinging ac a cennis wich a racquec on a courc

Ex Input:
Sentence: 'an old brown train in a busy city'. Replace the letter 'y' with 'l' in the sentence.

Ex Output:
an old brown train in a busl citl