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

Input: Consider Input: Sentence: 'a woman holds some baked goods at the convention'. Find frequency of the letter 'd'

Output: 3


Input: Consider Input: Sentence: 'four men standing around two pizzas in a conference room'. Find frequency of the letter 't'

Output: 2


Input: Consider Input: Sentence: 'a photo of a toilet which is not clean'. Find frequency of the letter 'w'


Output: 1