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

Input: Consider Input: Sentence: 'a couple of kids are sitting in a field'. Replace the letter 't' with 'v' in the sentence.

Output: a couple of kids are sivving in a field


Input: Consider Input: Sentence: 'a close up of a grassy beach showing an umbrella and wind board'. Replace the letter 'a' with 'f' in the sentence.

Output: f close up of f grfssy befch showing fn umbrellf fnd wind bofrd


Input: Consider Input: Sentence: 'a large commercial airplane landing on the runway'. Replace the letter 'r' with 'n' in the sentence.


Output: a lange commencial ainplane landing on the nunway