TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person is waiting for a pizza to come out of an oven fired grill'. Replace the letter 's' with 'k' in the sentence.

SOLUTION: a perkon ik waiting for a pizza to come out of an oven fired grill

PROBLEM: Sentence: 'a little girl is sitting in a suitcase in a library'. Replace the letter 't' with 'l' in the sentence.

SOLUTION: a lillle girl is silling in a suilcase in a library

PROBLEM: Sentence: 'there are two boats sailing through the water'. Replace the letter 'e' with 'a' in the sentence.

SOLUTION:
thara ara two boats sailing through tha watar