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

Input: Consider Input: Sentence: 'a very big nice looking living room with nice furnishings'. Find frequency of the letter 'e'

Output: 3


Input: Consider Input: Sentence: 'a person does a trick on a ramp on a snowboard'. Find frequency of the letter 's'

Output: 3


Input: Consider Input: Sentence: 'a parade on a street with several officers on motorcycles riding while confetti falls from the sky on them'. Find frequency of the letter 'a'


Output: 6