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

Example Input: Sentence: 'a crowd looking at a trio of planes that are sitting idle'. Replace the letter 'a' with 'e' in the sentence.
Example Output: e crowd looking et e trio of plenes thet ere sitting idle

Example Input: Sentence: 'this refrigerator is covered in stickers on it'. Replace the letter 't' with 'h' in the sentence.
Example Output: hhis refrigerahor is covered in shickers on ih

Example Input: Sentence: 'a room with a bed, lamps, tables and pillows'. Replace the letter 's' with 'b' in the sentence.
Example Output:
a room with a bed, lampb, tableb and pillowb