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

Input: Consider Input: Sentence: 'a bathroom that has it's lights turned on'. Find frequency of the letter 'h'

Output: 4


Input: Consider Input: Sentence: 'a bird in a tree looking up at branches'. Find frequency of the letter 'e'

Output: 3


Input: Consider Input: Sentence: 'a vase sits next to a toy and a pine cone'. Find frequency of the letter 't'


Output: 4