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

Input: Consider Input: Sentence: 'a dog has found a rather large stick for playing fetch'. Find frequency of the letter 't'

Output: 3


Input: Consider Input: Sentence: 'a group of people walking down a rain soaked street with umbrellas'. Find frequency of the letter 'w'

Output: 3


Input: Consider Input: Sentence: 'a group of people compete for a frisbe'. Find frequency of the letter 'o'


Output: 5