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

Input: Consider Input: Sentence: 'a tv in a glass mirror in the bathroom'. Find frequency of the letter 'h'

Output: 2


Input: Consider Input: Sentence: 'a double decker transit bus parks by a blue on the side of the street in front of a brick building in the city'. Find frequency of the letter 't'

Output: 9


Input: Consider Input: Sentence: 'a brown and white dog in a top hat and bow tie'. Find frequency of the letter 'b'


Output: 2