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

Example Input: Sentence: 'a couch, footrest, tv and other furniture are arranged in a living room'. Replace the letter 'o' with 'g' in the sentence.
Example Output: a cguch, fggtrest, tv and gther furniture are arranged in a living rggm

Example Input: Sentence: 'a child watching television changing the station with a remote'. Replace the letter 'n' with 'z' in the sentence.
Example Output: a child watchizg televisioz chazgizg the statioz with a remote

Example Input: Sentence: 'a delicous cola served with bread  on a table in a restaurant'. Replace the letter 'r' with 't' in the sentence.
Example Output:
a delicous cola setved with btead  on a table in a testautant