instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a shot looks down on a person riding a long board'. Replace the letter 'o' with 'u' in the sentence.
answer:
a shut luuks duwn un a persun riding a lung buard


question:
Sentence: 'street sign titled kittery maine state line in green'. Replace the letter 'e' with 'r' in the sentence.
answer:
strrrt sign titlrd kittrry mainr statr linr in grrrn


question:
Sentence: 'a number of sheep stand on a pedestal'. Replace the letter 'e' with 'u' in the sentence.
answer:

a numbur of shuup stand on a pudustal