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 is playing an interactive video game'. Find frequency of the letter 't'

Output: 2


Input: Consider Input: Sentence: 'a couple of buses parked on the side of the street'. Find frequency of the letter 'b'

Output: 1


Input: Consider Input: Sentence: 'two teenage boys are flying kites on top of a hill'. Find frequency of the letter 'f'


Output: 2