instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a boy catching a frisbee while standing ins bunch of leaves'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a girl sits on a surfboard and smiles'. Find frequency of the letter 'i'
answer:
3


question:
Sentence: 'several people sit at two tables eating pizza'. Find frequency of the letter 't'
answer:

5