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

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

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


Ex Input:
Sentence: 'a woman sitting on a wooden chair holding a cat'. Replace the letter 'n' with 'q' in the sentence.

Ex Output:
a womaq sittiqg oq a woodeq chair holdiqg a cat


Ex Input:
Sentence: 'a woman walks down the street with an umbrella'. Replace the letter 'w' with 'z' in the sentence.

Ex Output:

a zoman zalks dozn the street zith an umbrella