instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a social occasion of people are uncovered before the open day'. Find frequency of the letter 'c'
answer:
4


question:
Sentence: 'a woman walking with a child that is in a wheelchair'. Find frequency of the letter 'k'
answer:
1


question:
Sentence: 'a couple of animals that are in the grass'. Find frequency of the letter 'u'
answer:

1