instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'young boy flying kite in large field at outdoor event'. Find frequency of the letter 'y'
answer:
3


question:
Sentence: 'the street sign is next to a curved road'. Find frequency of the letter 's'
answer:
3


question:
Sentence: 'a few men walking through a market place'. Find frequency of the letter 'f'
answer:

1