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

Example Input: Sentence: 'a street side tree is filled with candles, teddy bears and balloons'. Replace the letter 'e' with 'c' in the sentence.
Example Output: a strcct sidc trcc is fillcd with candlcs, tcddy bcars and balloons

Example Input: Sentence: 'many street signs in front of a building while it is snowing'. Replace the letter 'r' with 'x' in the sentence.
Example Output: many stxeet signs in fxont of a building while it is snowing

Example Input: Sentence: 'a living room with a person playing with a kid'. Replace the letter 'l' with 'p' in the sentence.
Example Output:
a piving room with a person ppaying with a kid