instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a small white plane sitting on top of the ocean'. Find frequency of the letter 'e'
answer:
4


question:
Sentence: 'a bathroom that has it's lights turned on'. Find frequency of the letter 'h'
answer:
4


question:
Sentence: 'a lone zebra is grazing in the dirt of his enclosure'. Find frequency of the letter 'n'
answer:

4