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

SOLUTION: 4

PROBLEM: Sentence: 'the man is holding a plastic sled with snow in it next to a child'. Find frequency of the letter 'g'

SOLUTION: 1

PROBLEM: Sentence: 'a couple cutting their wedding cake together with one knife'. Find frequency of the letter 'e'

SOLUTION:
8