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

Input: Consider Input: Sentence: 'two young ladies that are dancing in the room together'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a man standing in front of a statue near a metal pole'. Find frequency of the letter 'f'

Output: 2


Input: Consider Input: Sentence: 'giraffe in a field with trees in it'. Find frequency of the letter 'i'


Output: 6