instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a burning wood stove has a tea pot sitting on top of it and is full of wood'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'people fishing and enlarge mountainlake with trees lining the shoreline'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'a jockey races his horse down the race track'. Find frequency of the letter 'r'
answer:

4