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

Input: Consider Input: Sentence: 'a man on stiltz is standing under a pink umbrella'. Find frequency of the letter 's'

Output: 3


Input: Consider Input: Sentence: 'decorated baseball cake in a clear plastic box'. Find frequency of the letter 'k'

Output: 1


Input: Consider Input: Sentence: 'a woman on her bed very sad looking'. Find frequency of the letter 'y'


Output: 1