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

Input: Consider Input: Sentence: 'eight donuts are cooked together in oil in a metal tray'. Find frequency of the letter 'h'

Output: 2


Input: Consider Input: Sentence: 'a tennis player after hitting a shot back to the other side of the court'. Find frequency of the letter 'n'

Output: 3


Input: Consider Input: Sentence: 'two zebras grazing on short grass in front of a hill'. Find frequency of the letter 't'


Output: 3