instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a piece of meat covered in ketchup next to a hamburger on a green plate'. Find frequency of the letter 'g'
answer:
2


question:
Sentence: 'a man swinging a bat while playing baseball'. Find frequency of the letter 'm'
answer:
1


question:
Sentence: 'a red fire hydrant next to a stone brick wall'. Find frequency of the letter 'n'
answer:

3