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

Input: Consider Input: Sentence: 'a half eaten doughnut in a persons hand'. Find frequency of the letter 'h'

Output: 3


Input: Consider Input: Sentence: 'a snowboarder making a jump of a snowy ledge'. Find frequency of the letter 'o'

Output: 4


Input: Consider Input: Sentence: 'a social occasion of people are uncovered before the open day'. Find frequency of the letter 'c'


Output: 4