instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'
answer:
4


question:
Sentence: 'a stop sign next to houses with christmas lights'. Find frequency of the letter 's'
answer:
7


question:
Sentence: 'a bicycle wheel is on a couple of stands'. Find frequency of the letter 'a'
answer:

3