instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'the large modern train is on the train track'. Find frequency of the letter 'm'
answer:
1


question:
Sentence: 'the snowboarder wearing a dark helmet sprays snow into the air'. Find frequency of the letter 'w'
answer:
3


question:
Sentence: 'a man in a red shirt is flying a kite'. Find frequency of the letter 'n'
answer:

3