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: 'a lonley giraffe is making a trek in the wild'. Replace the letter 'r' with 'h' in the sentence.

Output: a lonley gihaffe is making a thek in the wild


Input: Consider Input: Sentence: 'a keyboard and a mouse sitting on a table'. Replace the letter 't' with 'f' in the sentence.


Output: a keyboard and a mouse siffing on a fable