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

Example Input: Sentence: 'two girls holding blue umbrellas wearing shirts and plastic'. Replace the letter 'd' with 'y' in the sentence.
Example Output: two girls holying blue umbrellas wearing shirts any plastic

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: 'a vehicle is moving a bunch of sheep down the road'. Replace the letter 'o' with 'c' in the sentence.
Example Output:
a vehicle is mcving a bunch cf sheep dcwn the rcad