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: 'a crowd of fans watch soccer players from stadium seating'. Find frequency of the letter 'f'
answer:
3


question:
Sentence: 'a red duble decker bus with brick buildings in the background'. Find frequency of the letter 'u'
answer:

4