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 cars and house on truck passing in a street'. Find frequency of the letter 'i'

Output: 2


Input: Consider Input: Sentence: 'a man pushing a cart full of bananas'. Find frequency of the letter 'u'

Output: 2


Input: Consider Input: Sentence: 'a boy in the grass kicking a soccer ball and another player standing near the net'. Find frequency of the letter 'a'


Output: 9