instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a small doughnut held in a persons hand'. Find frequency of the letter 'n'
answer:
4


question:
Sentence: 'a group of people having dinner and drinking wine'. Find frequency of the letter 'r'
answer:
3


question:
Sentence: 'a blurry image of an italian meatball sandwich on a plate'. Find frequency of the letter 'a'
answer:

10