TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two zebras standing around while a third zebra drinks from a pond'. Find frequency of the letter 's'

SOLUTION: 3

PROBLEM: Sentence: 'a bowl of vegetables in a soup like substance next to a spoon'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'a person attached to a parachute gliding through the sky'. Find frequency of the letter 'h'

SOLUTION:
5