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: 'a wooden table topped with lots of sandwiches'. Replace the letter 's' with 'd' in the sentence.
answer:
a wooden table topped with lotd of dandwiched


question:
Sentence: 'a tour bus with an open back on a busy city street'. Replace the letter 't' with 'n' in the sentence.
answer:

a nour bus winh an open back on a busy ciny snreen