TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a piece of film shows two street signs crossing each other'. Find frequency of the letter 'f'

SOLUTION: 2

PROBLEM: Sentence: 'a glass vase sits between two statues'. Find frequency of the letter 'o'

SOLUTION: 1

PROBLEM: Sentence: 'the street sign is next to a curved road'. Find frequency of the letter 's'

SOLUTION:
3