instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a bed with a dog laying on it next to two laptop computers'. Find frequency of the letter 'n'
answer:
3

question:
Sentence: 'a double decker bus with a lot of people on board'. Find frequency of the letter 'l'
answer:
3

question:
Sentence: 'three horses are grazing in the snow covered pasture'. Find frequency of the letter 'e'
answer:
8