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

Example Input: Sentence: 'a person scooping from a large pot of soup on the stove into a soup bowl'. Replace the letter 'a' with 'x' in the sentence.
Example Output: x person scooping from x lxrge pot of soup on the stove into x soup bowl

Example Input: Sentence: 'there are peoople standign next to a bike'. Replace the letter 'o' with 't' in the sentence.
Example Output: there are pettple standign next tt a bike

Example Input: Sentence: 'a screen is showing a plane flying over a map of the atlantic ocean'. Replace the letter 'v' with 'y' in the sentence.
Example Output:
a screen is showing a plane flying oyer a map of the atlantic ocean