instruction:
In this task, you need to replace a letter in the sentence with another given letter.
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 person and a dog are on a bench'. Replace the letter 'e' with 'r' in the sentence.
answer:
a prrson and a dog arr on a brnch


question:
Sentence: 'a group of people riding skis on top of a snow covered field'. Replace the letter 'n' with 'x' in the sentence.
answer:

a group of people ridixg skis ox top of a sxow covered field