TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a wooden table topped with lots of sandwiches'. Replace the letter 's' with 'd' in the sentence.

SOLUTION: a wooden table topped with lotd of dandwiched

PROBLEM: Sentence: 'two giraffe standing in an enclosure at the zoo next to a  tree'. Replace the letter 'n' with 'g' in the sentence.

SOLUTION: two giraffe stagdigg ig ag egclosure at the zoo gext to a  tree

PROBLEM: Sentence: 'a sleepy dog rests its head on a stuffed animal'. Replace the letter 'n' with 'i' in the sentence.

SOLUTION:
a sleepy dog rests its head oi a stuffed aiimal