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 young boy holding a piece of paper on top of a table'. Find frequency of the letter 'y'

SOLUTION: 2

PROBLEM: Sentence: 'a duck flying above a large body of water'. Find frequency of the letter 'y'

SOLUTION:
2