In this task, you need to replace a letter in the sentence with another given letter.
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Question: Sentence: 'a city street at dusk time with traffic'. Replace the letter 'i' with 'm' in the sentence.

Answer: a cmty street at dusk tmme wmth traffmc


Question: Sentence: 'the airplane is parked on the runway for people to look at'. Replace the letter 'a' with 'e' in the sentence.

Answer: the eirplene is perked on the runwey for people to look et


Question: Sentence: 'a group of people standing on the outside of a train'. Replace the letter 'r' with 'u' in the sentence.

Answer:
a guoup of people standing on the outside of a tuain