instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a couple of men standing inside of a liquor store'. Find frequency of the letter 'p'
answer:
1


question:
Sentence: 'a surfer is in the middle of an ocean wave'. Find frequency of the letter 'i'
answer:
3


question:
Sentence: 'three zebras that are grazing on some grass'. Find frequency of the letter 'i'
answer:

1