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

Input: Consider Input: Sentence: 'a crowd stands under a set of lights in the ceiling and one person holds up a cell phone'. Replace the letter 'r' with 'f' in the sentence.

Output: a cfowd stands undef a set of lights in the ceiling and one pefson holds up a cell phone


Input: Consider Input: Sentence: 'someone playing frisbee with a dog in the middle of a court'. Replace the letter 'd' with 'r' in the sentence.

Output: someone playing frisbee with a rog in the mirrle of a court


Input: Consider Input: Sentence: 'a man riding a bicycle with a man standing on back of it'. Replace the letter 't' with 'v' in the sentence.


Output: a man riding a bicycle wivh a man svanding on back of iv