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

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

Output: 2


Input: Consider Input: Sentence: 'a teddy bear is sitting on a heart shaped patio chair outside'. Find frequency of the letter 'i'

Output: 6


Input: Consider Input: Sentence: 'a boy and a girl pointing to a roll on a plate'. Find frequency of the letter 'd'


Output: 1