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

Input: Consider Input: Sentence: 'people fishing and enlarge mountainlake with trees lining the shoreline'. Find frequency of the letter 't'

Output: 4


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: 'a red, white, and blue train sits on the tracks'. Find frequency of the letter 'h'


Output: 2