instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a giraffe and a zebra stare at each other'. Replace the letter 'g' with 'l' in the sentence.
answer:
a liraffe and a zebra stare at each other


question:
Sentence: 'a man on a surfboard riding on the waters waves'. Replace the letter 's' with 'k' in the sentence.
answer:
a man on a kurfboard riding on the waterk wavek


question:
Sentence: 'a person holding a green plastic knife getting ready to cut a white cake'. Replace the letter 'a' with 'k' in the sentence.
answer:

k person holding k green plkstic knife getting rekdy to cut k white ckke