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

Input: Consider Input: Sentence: 'a dog sitting in the back of a truck flat bed'. Find frequency of the letter 'h'

Output: 1


Input: Consider Input: Sentence: 'different sets of luggage in a baggage claim area'. Find frequency of the letter 'r'

Output: 2


Input: Consider Input: Sentence: 'a boy with a toothbrush in his mouth next to another boy'. Find frequency of the letter 'u'


Output: 2