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 with a skateboard that is in the street'. Find frequency of the letter 'o'

Output: 1


Input: Consider Input: Sentence: 'a social occasion of people are uncovered before the open day'. Find frequency of the letter 'c'

Output: 4


Input: Consider Input: Sentence: 'a lady holding a sandwich in her hand and looking for something else'. Find frequency of the letter 'n'


Output: 7