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

Input: Consider Input: Sentence: 'a bunch of cows that are in the field'. Find frequency of the letter 'a'

Output: 3


Input: Consider Input: Sentence: 'three woman are having a discussion in the kitchen'. Find frequency of the letter 'n'

Output: 5


Input: Consider Input: Sentence: 'total nine photos, 4 of prepared entrees, one of advertisement of yelp, 3 of people, one man holding "shaka" hawaii style hand gesture, suspect taken at an hawaii shopping mall'. Find frequency of the letter 'h'


Output: 7