instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'an commercial airline airplane flies above the clouds'. Find frequency of the letter 'n'
answer:
3


question:
Sentence: 'a boy that is sitting at a table with pizza'. Find frequency of the letter 's'
answer:
2


question:
Sentence: 'young people watch as an adult cuts a cake'. Find frequency of the letter 'p'
answer:

2