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

Input: Consider Input: Sentence: 'two men in black wet suits beside a white surfboard'. Find frequency of the letter 'e'

Output: 5


Input: Consider Input: Sentence: 'man in a sleeping bag on the floor using a laptop computer'. Find frequency of the letter 'i'

Output: 3


Input: Consider Input: Sentence: 'a single skier skiing through an area with snow and trees'. Find frequency of the letter 'l'


Output: 1