instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a person is water skiing and there are birds flying around above them'. Find frequency of the letter 'n'
answer:
5

question:
Sentence: 'a woman with short, brown hair is looking into a circular mirror and holding a camera up to her cheek'. Find frequency of the letter 'e'
answer:
4

question:
Sentence: 'a person skateboarding on a concrete ramp and a young child standing at the top of the ramp with a skateboard'. Find frequency of the letter 'a'
answer:
13