instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'apples, pears, and oranges are piled up for sale'. Find frequency of the letter 'a'
answer:
6


question:
Sentence: 'this is an image of a woman playing tennis'. Find frequency of the letter 'f'
answer:
1


question:
Sentence: 'a crowd of people skiing and enjoying the snow'. Find frequency of the letter 'o'
answer:

5