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

Input: Consider Input: Sentence: 'slices of orange are arranged on a plate'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'an audience watches as a bird spreads its wings'. Find frequency of the letter 'd'

Output: 3


Input: Consider Input: Sentence: 'a tiled floor with a toilet sitting on top of it'. Find frequency of the letter 't'


Output: 8