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

Input: Consider Input: Sentence: 'two baseball players high five each other during a game'. Find frequency of the letter 'y'

Output: 1


Input: Consider Input: Sentence: 'a bunch of green bananas is hanging on a tree'. Find frequency of the letter 'n'

Output: 7


Input: Consider Input: Sentence: 'a man in a truck filled with bottled water'. Find frequency of the letter 'a'


Output: 4