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

Input: Consider Input: Sentence: 'a man standing on a tennis court holding a racquet'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'

Output: 3


Input: Consider Input: Sentence: 'there is a man sitting on a green bench'. Find frequency of the letter 't'


Output: 3