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

Input: Consider Input: Sentence: 'a microwave oven with a yellow note on the door'. Find frequency of the letter 'w'

Output: 3


Input: Consider Input: Sentence: 'wooden and black bench on the side of the road'. Find frequency of the letter 'a'

Output: 3


Input: Consider Input: Sentence: 'a group of people standing around a table filled with assorted electronic devices'. Find frequency of the letter 'w'


Output: 1