TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a tower type building structure with a large clock and many windows in front of a cloudy blue sky'. Replace the letter 'n' with 'x' in the sentence.

SOLUTION: a tower type buildixg structure with a large clock axd maxy wixdows ix froxt of a cloudy blue sky

PROBLEM: Sentence: 'a man laying stretched out on the back of a boat'. Replace the letter 'h' with 'g' in the sentence.

SOLUTION: a man laying stretcged out on tge back of a boat

PROBLEM: Sentence: 'two men are jumping in the air playing frisbee'. Replace the letter 'e' with 'f' in the sentence.

SOLUTION:
two mfn arf jumping in thf air playing frisbff