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

Input: Consider Input: Sentence: 'man in a radio studio wearing a suit in front of a microphone'. Find frequency of the letter 't'

Output: 3


Input: Consider Input: Sentence: 'a white toilet sitting next to a bathroom sink'. Find frequency of the letter 'b'

Output: 1


Input: Consider Input: Sentence: 'people watch from the sidelines as a bulldog rides on a skateboard'. Find frequency of the letter 'e'


Output: 7