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

Example Input: Sentence: 'a bride and a groom look ridiculous as they stuff cake into each other's mouth'. Replace the letter 'd' with 's' in the sentence.
Example Output: a brise ans a groom look risiculous as they stuff cake into each other's mouth

Example Input: Sentence: 'a couple of giraffe standing next to each other'. Replace the letter 'i' with 'q' in the sentence.
Example Output: a couple of gqraffe standqng next to each other

Example Input: Sentence: 'tables at a fair one showing cakes up for competition'. Replace the letter 't' with 'b' in the sentence.
Example Output:
bables ab a fair one showing cakes up for compebibion