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 teddy bear playing a drum and a teddy bear playing a guitar'. Replace the letter 'd' with 'm' in the sentence.

Output: a temmy bear playing a mrum anm a temmy bear playing a guitar


Input: Consider Input: Sentence: 'two zebras in a field of grass with trees behind them'. Replace the letter 'd' with 'x' in the sentence.


Output: two zebras in a fielx of grass with trees behinx them