instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a safari setting at a zoo with two giraffes and a zebra'. Replace the letter 'n' with 'g' in the sentence.
answer:
a safari settigg at a zoo with two giraffes agd a zebra


question:
Sentence: 'a couple of white street signs sitting on top of a pole'. Replace the letter 'n' with 't' in the sentence.
answer:
a couple of white street sigts sittitg ot top of a pole


question:
Sentence: 'an avocado, an apple, a banana, a pear, and an orange'. Replace the letter 'p' with 'b' in the sentence.
answer:

an avocado, an abble, a banana, a bear, and an orange