instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'
answer:
3


question:
Sentence: 'a bunch of cows that are in the field'. Find frequency of the letter 'a'
answer:
3


question:
Sentence: 'a large brick building with a clock on the top of the front'. Find frequency of the letter 'f'
answer:

2