In this task, you need to replace a letter in the sentence with another given letter.

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

Sentence: 'a couple of horses with carriages at a building'. Replace the letter 'u' with 'm' in the sentence.
a comple of horses with carriages at a bmilding

Sentence: 'a close up of a tennis player swinging a tennis racket'. Replace the letter 'f' with 's' in the sentence.

a close up os a tennis player swinging a tennis racket