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

Input: Consider Input: Sentence: 'four men standing around two pizzas in a conference room'. Find frequency of the letter 't'

Output: 2


Input: Consider Input: Sentence: 'man in air skateboarding on street with building'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a woman is looking a giraffe standing in a field'. Find frequency of the letter 'n'


Output: 5