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: 'the bathroom is in need of remodel'. Find frequency of the letter 'e'

Output: 5


Input: Consider Input: Sentence: 'orange placed in bowl next wet marsh land'. Find frequency of the letter 'n'


Output: 4