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

Input: Consider Input: Sentence: 'a woman holds the reins of a saddled horse'. Find frequency of the letter 'm'

Output: 1


Input: Consider Input: Sentence: 'a grey hummingbird by fence and tree branches'. Find frequency of the letter 'y'

Output: 2


Input: Consider Input: Sentence: 'two people that are walking a dog together'. Find frequency of the letter 't'


Output: 5