instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a red train sitting at an empty station'. Replace the letter 'i' with 'h' in the sentence.
answer:
a red trahn shtthng at an empty stathon


question:
Sentence: 'a red stop signed has been altered to say stop hate'. Replace the letter 'e' with 't' in the sentence.
answer:
a rtd stop signtd has bttn alttrtd to say stop hatt


question:
Sentence: 'a bathroom with a toilet, sink and bathtub'. Replace the letter 'b' with 'w' in the sentence.
answer:

a wathroom with a toilet, sink and wathtuw