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

Input: Consider Input: Sentence: 'two baseball players high five each other during a game'. Find frequency of the letter 'y'

Output: 1


Input: Consider Input: Sentence: 'a number of small boats on a beach near an umbrella'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'an airplane is flying near a city harbor'. Find frequency of the letter 'e'


Output: 2