instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man sitting inside a green military truck talking to someone'. Find frequency of the letter 'i'
answer:
7


question:
Sentence: 'two people holding their skies in a snowy resort'. Find frequency of the letter 'n'
answer:
3


question:
Sentence: 'a multicolored kite against a blue sky with clouds'. Find frequency of the letter 'd'
answer:

2