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

SOLUTION: 5

PROBLEM: Sentence: 'a group of men standing around a table cutting a cake'. Find frequency of the letter 'g'

SOLUTION: 3

PROBLEM: Sentence: 'a prepared plate of dinner has meat and broccoli'. Find frequency of the letter 'p'

SOLUTION:
3