instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'
answer:
2


question:
Sentence: 'an area that has surrounded by a metal fence'. Find frequency of the letter 'o'
answer:
1


question:
Sentence: 'a bowl of cooked carrots and broccoli with a spoon'. Find frequency of the letter 'o'
answer:

9