TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'two children who are standing next to a white fire hydrant'. Replace the letter 't' with 'r' in the sentence.

SOLUTION: rwo children who are sranding nexr ro a whire fire hydranr

PROBLEM: Sentence: 'there is a woman holding a tennis racket'. Replace the letter 'l' with 's' in the sentence.

SOLUTION: there is a woman hosding a tennis racket

PROBLEM: Sentence: 'a bathroom with a white toilet sitting under a window'. Replace the letter 'b' with 'v' in the sentence.

SOLUTION:
a vathroom with a white toilet sitting under a window