instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'
answer:
3


question:
Sentence: 'two computers and a laptop set up on a desk'. Find frequency of the letter 'r'
answer:
1


question:
Sentence: 'a piece of carrot cake and cup of coffee are by a keyboard'. Find frequency of the letter 't'
answer:

1