instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a jet flying through the clear blue sky'. Find frequency of the letter 'g'
answer:
2


question:
Sentence: 'a baseball player dropping his bat and starting to run'. Find frequency of the letter 'o'
answer:
2


question:
Sentence: 'a boy with a hat on and a bat, glove and ball in his hands'. Find frequency of the letter 'd'
answer:

3


