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

Input: Consider Input: Sentence: 'a large formal living room with yellow couches and table'. Find frequency of the letter 'v'

Output: 1


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 variety of a different type of vegetables'. Find frequency of the letter 't'


Output: 4