instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a group of three dogs laying on a kitchen floor'. Find frequency of the letter 'r'
answer:
3


question:
Sentence: 'a desk covered in notepads, a laptop and other devices'. Find frequency of the letter 'c'
answer:
2


question:
Sentence: 'two men playing tennis on a tennis court'. Find frequency of the letter 'n'
answer:

7