instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a snow filled mountain with a guy with ski's'. Find frequency of the letter 'f'
answer:
1


question:
Sentence: 'a traffic signal by a wire filled with some birds'. Find frequency of the letter 'e'
answer:
3


question:
Sentence: 'a clock on a tall green pole in a city'. Find frequency of the letter 'c'
answer:

3