TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a rose that is sitting in a vase'. Replace the letter 'r' with 'j' in the sentence.

SOLUTION: a jose that is sitting in a vase

PROBLEM: Sentence: 'a man in a baseball cap watching something in the air'. Replace the letter 'g' with 'o' in the sentence.

SOLUTION: a man in a baseball cap watchino somethino in the air

PROBLEM: Sentence: 'many people walk around the city square with umbrellas'. Replace the letter 'e' with 'c' in the sentence.

SOLUTION:
many pcoplc walk around thc city squarc with umbrcllas