TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a half eaten doughnut in a persons hand'. Find frequency of the letter 'h'

SOLUTION: 3

PROBLEM: Sentence: 'an image of a cautionary construction sign'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'two bears swim in a blue pool of water'. Find frequency of the letter 'o'

SOLUTION:
4