instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a close up of a grassy beach showing an umbrella and wind board'. Replace the letter 'a' with 'f' in the sentence.
answer:
f close up of f grfssy befch showing fn umbrellf fnd wind bofrd


question:
Sentence: 'broccoli and a sweet potato are served on a white plate'. Replace the letter 'o' with 'c' in the sentence.
answer:
brccccli and a sweet pctatc are served cn a white plate


question:
Sentence: 'group of cats sitting on top of a bed with red blankets'. Replace the letter 'a' with 'u' in the sentence.
answer:

group of cuts sitting on top of u bed with red blunkets