instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'there is a person standing on a blue towel'. Find frequency of the letter 'n'
answer:
4


question:
Sentence: 'a man opening up a package sitting on a couch'. Find frequency of the letter 'n'
answer:
5


question:
Sentence: 'a bird flying above the water looking for food'. Find frequency of the letter 'f'
answer:

3