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

Input: Consider Input: Sentence: 'many street signs in front of a building while it is snowing'. Replace the letter 'r' with 'x' in the sentence.

Output: many stxeet signs in fxont of a building while it is snowing


Input: Consider Input: Sentence: 'a rose that is sitting in a vase'. Replace the letter 'r' with 'j' in the sentence.

Output: a jose that is sitting in a vase


Input: Consider Input: Sentence: 'a building with art work and a sidewlak with afire hydrant on it'. Replace the letter 's' with 'e' in the sentence.


Output: a building with art work and a eidewlak with afire hydrant on it