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

Input: Consider Input: Sentence: 'a family out snow skiing on a blustery day'. Find frequency of the letter 'i'

Output: 3


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: 'small girl sitting on the lap of a military uniformed man'. Find frequency of the letter 'i'


Output: 6