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

Input: Consider Input: Sentence: 'a man on a skateboard going down a ramp while people are watching'. Find frequency of the letter 'w'

Output: 3


Input: Consider Input: Sentence: 'a gray airplane with metal petals on the wings takes off from an airport'. Find frequency of the letter 'i'

Output: 4


Input: Consider Input: Sentence: 'cupcakes and various fruits in dishes on a table'. Find frequency of the letter 'a'


Output: 5