TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man standing on a tennis court holding a racquet'. Find frequency of the letter 's'

SOLUTION: 2

PROBLEM: Sentence: 'a tennis player that is running to get the tennis ball'. Find frequency of the letter 't'

SOLUTION: 7

PROBLEM: Sentence: 'two sheep grazing in the middle of a field'. Find frequency of the letter 'w'

SOLUTION:
1