instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a flock of sheep grazing in a park'. Find frequency of the letter 'f'
answer:
2

question:
Sentence: 'the man is holding a plastic sled with snow in it next to a child'. Find frequency of the letter 'g'
answer:
1

question:
Sentence: 'police officers riding bikes in the city at night'. Find frequency of the letter 'i'
answer:
8