instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a herd of zebra standing on top of a grass covered field'. Find frequency of the letter 'e'
answer:
5

question:
Sentence: 'a bunch of fruit sitting in a bowl, its overflowing'. Find frequency of the letter 't'
answer:
4

question:
Sentence: 'two people standing at a table cutting a cake'. Find frequency of the letter 'b'
answer:
1