instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a airplane view of a big factory some people and cars'. Find frequency of the letter 'f'
answer:
2


question:
Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'
answer:
4


question:
Sentence: 'a baseball player taking a swing at a ball'. Find frequency of the letter 'l'
answer:

5