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

Input: Consider Input: Sentence: 'a bus is stopped in front of a graphic statue'. Find frequency of the letter 'e'

Output: 2


Input: Consider Input: Sentence: 'this is a close up view of a tennis player during the game'. Find frequency of the letter 't'

Output: 3


Input: Consider Input: Sentence: 'a group of people sitting down with laptops'. Find frequency of the letter 'i'


Output: 3