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

Sentence: 'a man with scruffy hair wearing a tie and glasses'. Replace the letter 'r' with 'f' in the sentence.
a man with scfuffy haif weafing a tie and glasses

Sentence: 'a red stop sign sitting on the side of a road'. Replace the letter 'r' with 'o' in the sentence.
a oed stop sign sitting on the side of a ooad

Sentence: 'a fleet of airplanes fly in formation in the blue sky'. Replace the letter 'p' with 'g' in the sentence.

a fleet of airglanes fly in formation in the blue sky