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: 'a motorcycle sitting on the side of the road by grass'. Replace the letter 'r' with 't' in the sentence.

SOLUTION: a mototcycle sitting on the side of the toad by gtass

PROBLEM: Sentence: 'sandwich of rustic bread, with pickles, and applesauce'. Replace the letter 'l' with 'r' in the sentence.

SOLUTION:
sandwich of rustic bread, with pickres, and appresauce