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

Sentence: 'a dog laying in front of a horses stall with the horse peeking over the half door'. Replace the letter 'a' with 'b' in the sentence.
b dog lbying in front of b horses stbll with the horse peeking over the hblf door

Sentence: 'a man is somewhat hard to be seen in the wave, on his board'. Replace the letter 's' with 'b' in the sentence.
a man ib bomewhat hard to be been in the wave, on hib board

Sentence: 'a bunch of kids and adults are sitting together'. Replace the letter 'a' with 'k' in the sentence.

k bunch of kids knd kdults kre sitting together