instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a clock mounted above a door entrance with windows'. Replace the letter 's' with 'l' in the sentence.
answer:
a clock mounted above a door entrance with windowl

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: 'a group of people drive a big bus down the city'. Replace the letter 'c' with 'v' in the sentence.
answer:
a group of people drive a big bus down the vity