TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a double parking meter is decorated with a picture of a girl with wings on her feet'. Find frequency of the letter 'r'

SOLUTION: 6

PROBLEM: Sentence: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'a beautiful young woman standing next to a red piece of luggage'. Find frequency of the letter 'g'

SOLUTION:
5