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: 'the wooden kitchen has a small child's plastic table in it'. Find frequency of the letter 'n'

Output: 3


Input: Consider Input: Sentence: 'a group of people skiing down a snowy hill'. Find frequency of the letter 'o'


Output: 5