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

Input: Consider Input: Sentence: 'a plastic container next to a toilet on a wooden box'. Find frequency of the letter 'i'

Output: 3


Input: Consider Input: Sentence: 'this is a close up view of a tennis player during the game'. Find frequency of the letter 't'

Output: 3


Input: Consider Input: Sentence: 'clock statue sitting in front of a wall mirror'. Find frequency of the letter 'o'


Output: 4