TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two bigger elephants standing with a small elephant'. Find frequency of the letter 't'

SOLUTION: 5

PROBLEM: Sentence: 'an elephant has taken a man's hat in its trunk'. Find frequency of the letter 'p'

SOLUTION: 1

PROBLEM: Sentence: 'a dozen mixed donuts are sitting in a box'. Find frequency of the letter 'i'

SOLUTION:
4