instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'young girl playing with refrigerator magnet while kneeling on floor'. Find frequency of the letter 'n'
answer:
6

question:
Sentence: 'a young girl skiing down a snowy mountain'. Find frequency of the letter 'l'
answer:
1

question:
Sentence: 'an "eva air" airplane in an airport'. Find frequency of the letter 'r'
answer:
4