instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a couple of brown bears walking across a lush green field'. Replace the letter 'w' with 'o' in the sentence.
answer:
a couple of broon bears oalking across a lush green field


question:
Sentence: 'a house cat standing in front of television'. Replace the letter 'n' with 'p' in the sentence.
answer:
a house cat stapdipg ip fropt of televisiop


question:
Sentence: 'two worn sailboats with outriggers resting on a sandy beach'. Replace the letter 'w' with 'b' in the sentence.
answer:

tbo born sailboats bith outriggers resting on a sandy beach