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

Input: Consider Input: Sentence: 'a group of workers washing and cleaning fruits and vegetables'. Find frequency of the letter 'i'

Output: 3


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 group of fans sitting in the stands at an arena'. Find frequency of the letter 'i'


Output: 3