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

Input: Consider Input: Sentence: 'a couple of giraffe standing next to each other in a forest'. Replace the letter 'a' with 'w' in the sentence.

Output: w couple of girwffe stwnding next to ewch other in w forest


Input: Consider Input: Sentence: 'a couple of horses with carriages at a building'. Replace the letter 'u' with 'm' in the sentence.

Output: a comple of horses with carriages at a bmilding


Input: Consider Input: Sentence: 'a slice of pizza is sitting on a paper plate'. Replace the letter 'i' with 'v' in the sentence.


Output: a slvce of pvzza vs svttvng on a paper plate