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

Input: Consider Input: Sentence: 'surfboard being displayed in stor window with clothes behind it'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a group of workers washing and cleaning fruits and vegetables'. Find frequency of the letter 'i'

Output: 3


Input: Consider Input: Sentence: 'four people are in a long boat in the water'. Find frequency of the letter 'r'


Output: 3