instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man flying through the air on top of a skateboard'. Find frequency of the letter 'r'
answer:
3

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: 'an oven with stainless steel finish is shown'. Find frequency of the letter 'l'
answer:
2