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

Input: Consider Input: Sentence: 'a man that is on his cell phone'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'side view of two standing elephants with a man on neck of one, both elephants with trunks to ground, in front of two long logs outside with hut and trees behind'. Find frequency of the letter 'i'


Output: 9