instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a u.s. military helicopter landing or taking off'. Replace the letter 'i' with 'l' in the sentence.
answer:
a u.s. mllltary hellcopter landlng or taklng off

question:
Sentence: 'a red hydrant is sitting on the sidewalk in the city'. Replace the letter 'n' with 'r' in the sentence.
answer:
a red hydrart is sittirg or the sidewalk ir the city

question:
Sentence: 'a snowboarder is doing a trick mid air'. Replace the letter 'r' with 'h' in the sentence.
answer:
a snowboahdeh is doing a thick mid aih