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 bus with two floors belonging to london country'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'a giant piece of broccoli on top of a car windshield'. Find frequency of the letter 'b'
answer:

1