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

Input: Consider Input: Sentence: 'a row of lawn chairs with umbrellas over them'. Replace the letter 'e' with 'x' in the sentence.

Output: a row of lawn chairs with umbrxllas ovxr thxm


Input: Consider Input: Sentence: 'a building has a clock on the top of it'. Replace the letter 'l' with 'x' in the sentence.

Output: a buixding has a cxock on the top of it


Input: Consider Input: Sentence: 'a girl that is just swung a tennis racket'. Replace the letter 's' with 'k' in the sentence.


Output: a girl that ik jukt kwung a tennik racket