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

Sentence: 'a boy riding his skate board on an obstacle course'. Replace the letter 'e' with 'b' in the sentence.
a boy riding his skatb board on an obstaclb coursb

Sentence: 'a suitcase is sitting on a sidewalk near trees'. Replace the letter 's' with 'd' in the sentence.
a duitcade id ditting on a didewalk near treed

Sentence: 'a man leaning over while fixing a toilet'. Replace the letter 'a' with 'w' in the sentence.

w mwn lewning over while fixing w toilet