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

Example Input: Sentence: 'the bus is trying to navigate though the london traffic'. Replace the letter 'a' with 'l' in the sentence.
Example Output: the bus is trying to nlviglte though the london trlffic

Example Input: Sentence: 'street signs hanging next to a traffic light on a city street'. Replace the letter 'g' with 'm' in the sentence.
Example Output: street simns hanminm next to a traffic limht on a city street

Example Input: Sentence: 'two dogs sleeping on a  big bed with a guy'. Replace the letter 'i' with 'j' in the sentence.
Example Output:
two dogs sleepjng on a  bjg bed wjth a guy