TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person and a dog are on a bench'. Replace the letter 'e' with 'r' in the sentence.

SOLUTION: a prrson and a dog arr on a brnch

PROBLEM: Sentence: 'a woman in blue jacket shaving a cows utters'. Replace the letter 'h' with 'q' in the sentence.

SOLUTION: a woman in blue jacket sqaving a cows utters

PROBLEM: Sentence: 'a man walking on rocks carrying a surfboard'. Replace the letter 'k' with 't' in the sentence.

SOLUTION:
a man walting on rocts carrying a surfboard