instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'two police officers riding horses down the street'. Replace the letter 'o' with 'd' in the sentence.
answer:
twd pdlice dfficers riding hdrses ddwn the street


question:
Sentence: 'a plane getting ready to land on a runway'. Replace the letter 'n' with 'o' in the sentence.
answer:
a plaoe gettiog ready to laod oo a ruoway


question:
Sentence: 'a white horse in water and a train in the background'. Replace the letter 'a' with 'm' in the sentence.
answer:

m white horse in wmter mnd m trmin in the bmckground