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: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'

Output: 5


Input: Consider Input: Sentence: 'a woman is sitting pulling something in a bathroom'. Find frequency of the letter 'g'


Output: 3