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 surf board in the ocean'. Find frequency of the letter 'f'

Output: 1


Input: Consider Input: Sentence: 'a group of people having dinner and drinking wine'. Find frequency of the letter 'r'

Output: 3


Input: Consider Input: Sentence: 'a multicolored vase with several blooming red flowers in it'. Find frequency of the letter 'i'


Output: 5