instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a boy riding his skate board on an obstacle course'. Replace the letter 'e' with 'b' in the sentence.
answer:
a boy riding his skatb board on an obstaclb coursb


question:
Sentence: 'a house cat sits on an oven door, sniffing the oven racks inside'. Replace the letter 'i' with 'y' in the sentence.
answer:
a house cat syts on an oven door, snyffyng the oven racks ynsyde


question:
Sentence: 'a bunch of people gathered together for a small party'. Replace the letter 'a' with 'm' in the sentence.
answer:

m bunch of people gmthered together for m smmll pmrty