In this task, you need to count the number of times the given letter appears in the given sentence.

[EX Q]: Sentence: 'a double parking meter is decorated with a picture of a girl with wings on her feet'. Find frequency of the letter 'r'
[EX A]: 6

[EX Q]: Sentence: 'the skateboarder has on red and black sneakers and is riding a skateboard'. Find frequency of the letter 'g'
[EX A]: 1

[EX Q]: Sentence: 'a burgundy and white tiled public men's restroom'. Find frequency of the letter 'w'
[EX A]:
1