TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a snow filled mountain with a guy with ski's'. Find frequency of the letter 'f'

SOLUTION: 1

PROBLEM: Sentence: 'a man holding a baseball bat an playing baseball'. Find frequency of the letter 'l'

SOLUTION: 6

PROBLEM: Sentence: 'a woman in a tennis skirt swinging her tennis racket at a tennis ball'. Find frequency of the letter 'a'

SOLUTION:
7