instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a woman sitting on a bench under a gazebo'. Replace the letter 's' with 'u' in the sentence.
answer:
a woman uitting on a bench under a gazebo


question:
Sentence: 'a baby pokes his head out of a suitcase'. Replace the letter 'u' with 's' in the sentence.
answer:
a baby pokes his head ost of a ssitcase


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