instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a person does a trick on a ramp on a snowboard'. Find frequency of the letter 's'
answer:
3


question:
Sentence: 'a person holding onto a pink kite at the beach'. Find frequency of the letter 'n'
answer:
4


question:
Sentence: 'three woman preparing food on a kitchen counter'. Find frequency of the letter 'r'
answer:

4