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 young girl skiing down a snowy mountain'. Find frequency of the letter 'l'

Output: 1


Input: Consider Input: Sentence: 'a young man standing in a bathroom next to a white toilet'. Find frequency of the letter 'n'


Output: 6