instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'man sitting on the side of a van playing the guitar'. Find frequency of the letter 'm'
answer:
1


question:
Sentence: 'a bird in a tree looking up at branches'. Find frequency of the letter 'e'
answer:
3


question:
Sentence: 'food cooking inside of an electric oven on a baking sheet'. Find frequency of the letter 'a'
answer:

3