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

Input: Consider Input: Sentence: 'a display case filled with lots of different clocks'. Find frequency of the letter 'w'

Output: 1


Input: Consider Input: Sentence: 'a woman cross country skiing in a competition'. Find frequency of the letter 's'

Output: 3


Input: Consider Input: Sentence: 'a bathroom with a toilet, sink and a mirrored cabinet'. Find frequency of the letter 'e'


Output: 3