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

Input: Consider Input: Sentence: 'a tower with some bright lights and clocks on it'. Find frequency of the letter 'h'

Output: 3


Input: Consider Input: Sentence: 'a girl that has a kite in the air'. Find frequency of the letter 'r'

Output: 2


Input: Consider Input: Sentence: 'a large kitchen has three men at the counters'. Find frequency of the letter 'e'


Output: 7