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

Input: Consider Input: Sentence: 'a woman fully dressed as a geisha'. Find frequency of the letter 'm'

Output: 1


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 group of giraffes standing in a grassy area next to a pond'. Find frequency of the letter 'r'


Output: 4