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: 'young girl playing with refrigerator magnet while kneeling on floor'. Find frequency of the letter 'n'

Output: 6


Input: Consider Input: Sentence: 'a woman walking across a beach in her panties and a blue shirt'. Find frequency of the letter 'e'


Output: 4