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

Example Input: Sentence: 'a group of people hanging around holding umbrellas'. Replace the letter 'p' with 'f' in the sentence.
Example Output: a grouf of feofle hanging around holding umbrellas

Example Input: Sentence: 'a person holding on to a black remote'. Replace the letter 'n' with 'h' in the sentence.
Example Output: a persoh holdihg oh to a black remote

Example Input: Sentence: 'there are movies playing behind the seats on the airplane'. Replace the letter 'v' with 'h' in the sentence.
Example Output:
there are mohies playing behind the seats on the airplane