instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man is taking a picture of a man and woman'. Find frequency of the letter 'a'
answer:
8


question:
Sentence: 'a large grass pasture land with sheep grazing on grass'. Find frequency of the letter 'a'
answer:
7


question:
Sentence: 'a cat sitting in front of a bike tire'. Find frequency of the letter 'a'
answer:

3