In this task, you need to replace a letter in the sentence with another given letter.

Q: Sentence: 'a blue and white train is coming down some tracks'. Replace the letter 'b' with 'u' in the sentence.

A: a ulue and white train is coming down some tracks
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Q: Sentence: 'a man is posing in a desert, leaning on a sign with an image of a camel on it'. Replace the letter 'i' with 'r' in the sentence.

A: a man rs posrng rn a desert, leanrng on a srgn wrth an rmage of a camel on rt
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Q: Sentence: 'people standing on a bridge with a big clock on the tower'. Replace the letter 'r' with 'm' in the sentence.

A:
people standing on a bmidge with a big clock on the towem
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