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

Input: Consider Input: Sentence: 'a desk covered in notepads, a laptop and other devices'. Find frequency of the letter 'c'

Output: 2


Input: Consider Input: Sentence: 'a man walking a large elephant down a dirt road'. Find frequency of the letter 'g'

Output: 2


Input: Consider Input: Sentence: 'a person dressed all in black snowboarding down a slope'. Find frequency of the letter 'e'


Output: 4