TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'an older red airplane is going straight up'. Replace the letter 'h' with 'z' in the sentence.

SOLUTION: an older red airplane is going straigzt up

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 piece of cheesecake has whip cream and bananas on it'. Replace the letter 'e' with 'i' in the sentence.

SOLUTION:
a piici of chiisicaki has whip criam and bananas on it