instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'there is a sandwich with a lot of meat cut in half'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'
answer:
3


question:
Sentence: 'a door in a living room opens up to a bedroom'. Find frequency of the letter 'o'
answer:

8