instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man standing on a surf board in the ocean'. Find frequency of the letter 'f'
answer:
1


question:
Sentence: 'a photo of a couple of people at a convention'. Find frequency of the letter 'v'
answer:
1


question:
Sentence: 'a small piece of pie and some strawberries on a plate'. Find frequency of the letter 'l'
answer:

3