instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a variety of a different type of vegetables'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'two zebras standing around while a third zebra drinks from a pond'. Find frequency of the letter 's'
answer:
3


question:
Sentence: 'several kites are being flown on a beach'. Find frequency of the letter 'a'
answer:

4