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

Input: Consider Input: Sentence: 'a polar bear relaxing in a man-made pool'. Replace the letter 'r' with 'x' in the sentence.

Output: a polax beax xelaxing in a man-made pool


Input: Consider Input: Sentence: 'a family opens gifts in a room with their dog, while sitting on couches'. Replace the letter 's' with 'l' in the sentence.

Output: a family openl giftl in a room with their dog, while litting on couchel


Input: Consider Input: Sentence: 'a living room area with a white couch and pillows on it'. Replace the letter 'i' with 'w' in the sentence.


Output: a lwvwng room area wwth a whwte couch and pwllows on wt