instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a plastic container next to a toilet on a wooden box'. Find frequency of the letter 'i'
answer:
3

question:
Sentence: 'a small white dog looking out a car window'. Find frequency of the letter 'l'
answer:
3

question:
Sentence: 'a small herd of cattle pause to rest by a pond'. Find frequency of the letter 'a'
answer:
5