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

Input: Consider Input: Sentence: 'two people in a snowy place near a wooden fence'. Find frequency of the letter 'n'

Output: 5


Input: Consider Input: Sentence: 'an elephant with broken tusks stands in front of a hill and boulders'. Find frequency of the letter 'n'

Output: 7


Input: Consider Input: Sentence: 'a desk with a keyboard and a monitor on it'. Find frequency of the letter 't'


Output: 3