instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a memorial with various plaques and american flags on it'. Replace the letter 'a' with 'k' in the sentence.
answer:
k memorikl with vkrious plkques knd kmerickn flkgs on it

question:
Sentence: 'a man riding a snowboard on the side of a wall'. Replace the letter 'm' with 'p' in the sentence.
answer:
a pan riding a snowboard on the side of a wall

question:
Sentence: 'man takes a photo of a woman brushing her teeth in the mirror'. Replace the letter 'r' with 'b' in the sentence.
answer:
man takes a photo of a woman bbushing heb teeth in the mibbob