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

Input: Consider Input: Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'

Output: 5


Input: Consider Input: Sentence: 'a player swings his bat at a baseball game'. Find frequency of the letter 'p'

Output: 1


Input: Consider Input: Sentence: 'a man in a white suit talking on a microphone'. Find frequency of the letter 'i'


Output: 5