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

Example Input: Sentence: 'top view of a bathroom including tub, sink and toilet'. Replace the letter 'f' with 'o' in the sentence.
Example Output: top view oo a bathroom including tub, sink and toilet

Example Input: Sentence: 'a fire hydrant with a message painted on it'. Replace the letter 'n' with 'j' in the sentence.
Example Output: a fire hydrajt with a message paijted oj it

Example Input: Sentence: 'people watching the fire truck on the street'. Replace the letter 'r' with 's' in the sentence.
Example Output:
people watching the fise tsuck on the stseet