instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a woman is standing on a street curb'. Replace the letter 'a' with 't' in the sentence.
answer:
t womtn is sttnding on t street curb


question:
Sentence: 'a yellow fire truck parked in a parking lot'. Replace the letter 'a' with 'y' in the sentence.
answer:
y yellow fire truck pyrked in y pyrking lot


question:
Sentence: 'three snowboarders getting ready to take off down the slopes'. Replace the letter 'r' with 'f' in the sentence.
answer:

thfee snowboafdefs getting feady to take off down the slopes