TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a bunch of cows that are in the field'. Find frequency of the letter 'a'

SOLUTION: 3

PROBLEM: Sentence: 'a boy swinging a bat while playing baseball'. Find frequency of the letter 'h'

SOLUTION: 1

PROBLEM: Sentence: 'three big elephants walking the grass in a jungle'. Find frequency of the letter 'k'

SOLUTION:
1