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

Input: Consider Input: Sentence: 'a jet flying through the clear blue sky'. Find frequency of the letter 'g'

Output: 2


Input: Consider Input: Sentence: 'a few men walking through a market place'. Find frequency of the letter 'f'

Output: 1


Input: Consider Input: Sentence: 'a group of people and a television in a room'. Find frequency of the letter 'v'


Output: 1