TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a glass a rope and a pair of scissors'. Find frequency of the letter 's'

SOLUTION: 6

PROBLEM: Sentence: 'a person is water skiing and there are birds flying around above them'. Find frequency of the letter 'n'

SOLUTION: 5

PROBLEM: Sentence: 'a somewhat surreal art display made of plants'. Find frequency of the letter 'e'

SOLUTION:
3