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

Input: Consider Input: Sentence: 'a red train moves over snowy rail road tracks'. Replace the letter 'v' with 'w' in the sentence.

Output: a red train mowes ower snowy rail road tracks

Input: Consider Input: Sentence: 'a person holding a small remote key chain'. Replace the letter 'n' with 'j' in the sentence.

Output: a persoj holdijg a small remote key chaij

Input: Consider Input: Sentence: 'a skateboarder is in mid air doing a trick'. Replace the letter 'b' with 'x' in the sentence.
Output: a skatexoarder is in mid air doing a trick