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

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

Example Input: Sentence: 'a yellow fire hydrant sitting on the sidewalk'. Replace the letter 'o' with 'd' in the sentence.
Example Output: a yelldw fire hydrant sitting dn the sidewalk

Example Input: Sentence: 'two out of five skateboarders are starting to ride a half pipe'. Replace the letter 'p' with 'o' in the sentence.
Example Output:
two out of five skateboarders are starting to ride a half oioe