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

Input: Consider Input: Sentence: 'a herd of cattle standing on a lush green field'. Replace the letter 'g' with 'f' in the sentence.

Output: a herd of cattle standinf on a lush freen field


Input: Consider Input: Sentence: 'a couple of giraffe standing next to each other'. Replace the letter 't' with 'c' in the sentence.

Output: a couple of giraffe scanding nexc co each ocher


Input: Consider Input: Sentence: 'a dog that is laying on its back on a couch'. Replace the letter 'n' with 'o' in the sentence.


Output: a dog that is layiog oo its back oo a couch