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

Input: Consider Input: Sentence: 'a golden haired dog looking out of an open window'. Find frequency of the letter 'd'

Output: 4


Input: Consider Input: Sentence: 'two giraffes standing next to some trees'. Find frequency of the letter 'f'

Output: 2


Input: Consider Input: Sentence: 'a young man holding a remote control watching intently'. Find frequency of the letter 'w'


Output: 1