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

Input: Consider Input: Sentence: 'a girl playing with a frisbee while people watch'. Find frequency of the letter 'e'

Output: 5


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

Output: 1


Input: Consider Input: Sentence: 'people gathered together on a neighborhood city street'. Find frequency of the letter 'e'


Output: 9