instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'man in red shirt with black suitcase standing outside of building'. Find frequency of the letter 'i'
answer:
8


question:
Sentence: 'a small white dog looking out a car window'. Find frequency of the letter 'l'
answer:
3


question:
Sentence: 'a man holding a skateboard over the top of his head'. Find frequency of the letter 'o'
answer:

5