instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a girl that has a kite in the air'. Find frequency of the letter 'r'
answer:
2


question:
Sentence: 'a couple of items that are on the wall'. Find frequency of the letter 'm'
answer:
1


question:
Sentence: 'a man that is sitting down with a cellphone'. Find frequency of the letter 'n'
answer:

4