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 person snow skiing down a hill while the hold their ski poles'. Replace the letter 'r' with 'g' in the sentence.
Example Output: a pegson snow skiing down a hill while the hold theig ski poles

Example Input: Sentence: 'a dog that is laying on its back on a couch'. Replace the letter 'n' with 'o' in the sentence.
Example Output:
a dog that is layiog oo its back oo a couch