instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'man in a sleeping bag on the floor using a laptop computer'. Find frequency of the letter 'i'
answer:
3


question:
Sentence: 'a man skating down a stair rail in front of a bunch of people'. Find frequency of the letter 'o'
answer:
5


question:
Sentence: 'a bird perched on top of a wooden power pole'. Find frequency of the letter 'p'
answer:

4