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

Input: Consider Input: Sentence: 'a group of people standing around a table filled with assorted electronic devices'. Find frequency of the letter 'w'

Output: 1


Input: Consider Input: Sentence: 'a tv in a glass mirror in the bathroom'. Find frequency of the letter 'h'

Output: 2


Input: Consider Input: Sentence: 'a cat standing on its hind legs reaching for a picture of a speed skater on the television set'. Find frequency of the letter 'o'


Output: 5