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

Input: Consider Input: Sentence: 'a blue fire hydrant painted on the bottom of it'. Find frequency of the letter 'h'

Output: 2


Input: Consider Input: Sentence: 'a dog has found a rather large stick for playing fetch'. Find frequency of the letter 't'

Output: 3


Input: Consider Input: Sentence: 'a green vase filled with multi colored candy canes'. Find frequency of the letter 'n'


Output: 3