instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a woman walks by with a large suitcase and a polka dot umbrella'. Replace the letter 'e' with 'n' in the sentence.
answer:
a woman walks by with a largn suitcasn and a polka dot umbrnlla


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: 'there is a blue train stopping at station one'. Replace the letter 'h' with 'x' in the sentence.
answer:

txere is a blue train stopping at station one