In this task, you need to replace a letter in the sentence with another given letter.

Sentence: 'a yellow fire hydrant sitting on the sidewalk'. Replace the letter 'o' with 'd' in the sentence.
a yelldw fire hydrant sitting dn the sidewalk

Sentence: 'a safari setting at a zoo with two giraffes and a zebra'. Replace the letter 'n' with 'g' in the sentence.
a safari settigg at a zoo with two giraffes agd a zebra

Sentence: 'an air force plane at the airport ready to takeoff'. Replace the letter 'o' with 'd' in the sentence.
an air fdrce plane at the airpdrt ready td takedff