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

Input: Consider Input: Sentence: 'salad and vegetables with me on top of plate'. Find frequency of the letter 'o'

Output: 3


Input: Consider Input: Sentence: 'statues of 2 zebras and 1 giraffe in a doorway'. Find frequency of the letter 'a'

Output: 6


Input: Consider Input: Sentence: 'a tall massive clock tower towering over a city'. Find frequency of the letter 'v'


Output: 2