instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a man is somewhat hard to be seen in the wave, on his board'. Replace the letter 's' with 'b' in the sentence.
answer:
a man ib bomewhat hard to be been in the wave, on hib board

question:
Sentence: 'commuter trains on tracks next to paved platform'. Replace the letter 'm' with 'w' in the sentence.
answer:
cowwuter trains on tracks next to paved platforw

question:
Sentence: 'a fork is laying on a half eaten plate of food'. Replace the letter 'o' with 'z' in the sentence.
answer:
a fzrk is laying zn a half eaten plate zf fzzd