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 blue fire hydrant painted on the bottom of it'. Find frequency of the letter 'h'
answer:
2


question:
Sentence: 'a plastic plastic plate topped with three different type of food'. Find frequency of the letter 'l'
answer:

3