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

Input: Consider Input: Sentence: 'a toilet filled with a brown liner and dirty water'. Find frequency of the letter 't'

Output: 5


Input: Consider Input: Sentence: 'three men are in a kitchen cooking and cutting through a dish'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a towel hanging next to a toilet in a bathroom'. Find frequency of the letter 'o'


Output: 5