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

Example Input: Sentence: 'a hipster riding a skateboard up the side of a wall'. Replace the letter 's' with 'm' in the sentence.
Example Output: a hipmter riding a mkateboard up the mide of a wall

Example Input: Sentence: 'a man dressed in a knight costume riding a horse performing at a show'. Replace the letter 'e' with 'j' in the sentence.
Example Output: a man drjssjd in a knight costumj riding a horsj pjrforming at a show

Example Input: Sentence: 'a man in a wet suit holding a surfboard while heading for the ocean waves'. Replace the letter 'g' with 'z' in the sentence.
Example Output:
a man in a wet suit holdinz a surfboard while headinz for the ocean waves