instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'salad and vegetables with me on top of plate'. Find frequency of the letter 'o'
answer:
3


question:
Sentence: 'this is a sign in front of a large cathedral'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a plate with food sitting on a table with a knife and fork'. Find frequency of the letter 'a'
answer:

6