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

Input: Consider Input: Sentence: 'a black horse with a white dot on its forehead'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a woman in a messy kitchen with a child'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a tugboat in the water has two occupants'. Find frequency of the letter 'a'


Output: 5