instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a bunch of cows that are in the field'. Find frequency of the letter 'a'
answer:
3


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


question:
Sentence: 'a person touching the coin loading area of a parking meter'. Find frequency of the letter 'i'
answer:

4