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

Input: Consider Input: Sentence: 'a baseball player dropping his bat and starting to run'. Find frequency of the letter 'o'

Output: 2


Input: Consider Input: Sentence: 'a train on a train track going through a bunch of trees'. Find frequency of the letter 'u'

Output: 2


Input: Consider Input: Sentence: 'a video game system and some remote controls'. Find frequency of the letter 'd'


Output: 2