TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person under an open umbrella in the sand'. Replace the letter 'd' with 'h' in the sentence.

SOLUTION: a person unher an open umbrella in the sanh

PROBLEM: Sentence: 'the entree on the long plate is in the middle of the wooden table'. Replace the letter 'h' with 'z' in the sentence.

SOLUTION: tze entree on tze long plate is in tze middle of tze wooden table

PROBLEM: Sentence: 'a group of people flying kites and walking in a park'. Replace the letter 'e' with 'z' in the sentence.

SOLUTION:
a group of pzoplz flying kitzs and walking in a park