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

Input: Consider Input: Sentence: 'a very big nice looking living room with nice furnishings'. Find frequency of the letter 'e'

Output: 3


Input: Consider Input: Sentence: 'a toilet sits in a cluttered bathroom next to a sink'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'man on green hillside with cattle behind him'. Find frequency of the letter 's'


Output: 1