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

Input: Consider Input: Sentence: 'subway train approaching the platform of a subway station'. Replace the letter 'y' with 'c' in the sentence.

Output: subwac train approaching the platform of a subwac station


Input: Consider Input: Sentence: 'a couple of men playing a  game of tennis'. Replace the letter 'n' with 'c' in the sentence.

Output: a couple of mec playicg a  game of teccis


Input: Consider Input: Sentence: 'a pink flower lies beside another that is in a vase'. Replace the letter 'r' with 'g' in the sentence.


Output: a pink floweg lies beside anotheg that is in a vase