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 in front of a statue near a metal pole'. Find frequency of the letter 'f'

Output: 2


Input: Consider Input: Sentence: 'an image of a cautionary construction sign'. Find frequency of the letter 'a'

Output: 5


Input: Consider Input: Sentence: 'two zebras stand in a field with rocks together'. Find frequency of the letter 'r'


Output: 3