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

Example Input: Sentence: 'a statue of a person holding their arm up in the air'. Replace the letter 'p' with 'h' in the sentence.
Example Output: a statue of a herson holding their arm uh in the air

Example Input: Sentence: 'a skater looks ahead as he rides down a ramp'. Replace the letter 'n' with 'm' in the sentence.
Example Output: a skater looks ahead as he rides dowm a ramp

Example Input: Sentence: 'a woman serves a ball with a clock in the background'. Replace the letter 'i' with 'x' in the sentence.
Example Output:
a woman serves a ball wxth a clock xn the background