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 young woman dressed in green and black operating a remote control'. Find frequency of the letter 'r'

SOLUTION: 5

PROBLEM: Sentence: 'a fluffy white car looking in a mirror'. Find frequency of the letter 'k'

SOLUTION:
1