instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'the cargo train is headed to the next destination'. Replace the letter 'h' with 'x' in the sentence.
answer:
txe cargo train is xeaded to txe next destination


question:
Sentence: 'a hipster riding a skateboard up the side of a wall'. Replace the letter 's' with 'm' in the sentence.
answer:
a hipmter riding a mkateboard up the mide of a wall


question:
Sentence: 'a cloudy sky street scene cars and a cafe'. Replace the letter 'r' with 'b' in the sentence.
answer:

a cloudy sky stbeet scene cabs and a cafe