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

Example Input: Sentence: 'a couple of giraffes eat some food out of a trey'. Replace the letter 'f' with 'e' in the sentence.
Example Output: a couple oe giraeees eat some eood out oe a trey

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

Example Input: Sentence: 'the  men are looking at the painting of vegetables, and the dog is peeking at it  through the legs of his owner'. Replace the letter 'k' with 'j' in the sentence.
Example Output:
the  men are loojing at the painting of vegetables, and the dog is peejing at it  through the legs of his owner