TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a woman walks by with a large suitcase and a polka dot umbrella'. Replace the letter 'e' with 'n' in the sentence.

SOLUTION: a woman walks by with a largn suitcasn and a polka dot umbrnlla

PROBLEM: Sentence: 'subway train approaching the platform of a subway station'. Replace the letter 'y' with 'c' in the sentence.

SOLUTION: subwac train approaching the platform of a subwac station

PROBLEM: Sentence: 'a woman holding a banana in both hands'. Replace the letter 'n' with 'o' in the sentence.

SOLUTION:
a womao holdiog a baoaoa io both haods