instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a pair of planes in an airport lot parked for boarding and exiting'. Replace the letter 'e' with 'o' in the sentence.
answer:
a pair of planos in an airport lot parkod for boarding and oxiting


question:
Sentence: 'a black cat is sniffing a glass bottle'. Replace the letter 'c' with 'f' in the sentence.
answer:
a blafk fat is sniffing a glass bottle


question:
Sentence: 'a white sign is displayed, reading "bart ba."'. Replace the letter 't' with 'v' in the sentence.
answer:

a whive sign is displayed, reading "barv ba."