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

Example Input: Sentence: 'a large bedroom with art over the bed'. Replace the letter 'r' with 'o' in the sentence.
Example Output: a laoge bedooom with aot oveo the bed

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 cupcake, piece of cake, and tort with raspberries'. Replace the letter 'd' with 'y' in the sentence.
Example Output:
a cupcake, piece of cake, any tort with raspberries