TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'vita mix blender with something in it already blended'. Replace the letter 'b' with 'a' in the sentence.

SOLUTION: vita mix alender with something in it already alended

PROBLEM: Sentence: 'a polar bear relaxing in a man-made pool'. Replace the letter 'r' with 'x' in the sentence.

SOLUTION: a polax beax xelaxing in a man-made pool

PROBLEM: Sentence: 'an man and a young girl on a motorcycle'. Replace the letter 'a' with 'v' in the sentence.

SOLUTION:
vn mvn vnd v young girl on v motorcycle