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

Input: Consider Input: Sentence: 'a glass vase sits between two statues'. Find frequency of the letter 'o'

Output: 1


Input: Consider Input: Sentence: 'a young boy standing in front of a counter with dougnuts'. Find frequency of the letter 'o'

Output: 6


Input: Consider Input: Sentence: 'a number of small boats on a beach near an umbrella'. Find frequency of the letter 's'


Output: 2