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 young man with glasses on is taking a big bite'. Find frequency of the letter 's'
answer:
4


question:
Sentence: 'a man sitting at a table in front of a laptop computer'. Find frequency of the letter 'a'
answer:

7