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

Input: Consider Input: Sentence: 'a skier with his legs covered in snow lifts one of his feet to stamp it'. Replace the letter 's' with 'y' in the sentence.

Output: a ykier with hiy legy covered in ynow lifty one of hiy feet to ytamp it


Input: Consider Input: Sentence: 'people wait for a train on a snowy sidewalk'. Replace the letter 'n' with 'm' in the sentence.

Output: people wait for a traim om a smowy sidewalk


Input: Consider Input: Sentence: 'a red bus with a sign on it for advertising traveling down the street'. Replace the letter 'w' with 'i' in the sentence.


Output: a red bus iith a sign on it for advertising traveling doin the street