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

Input: Consider Input: Sentence: 'two metal  benches on an empty train platform'. Find frequency of the letter 'n'

Output: 4


Input: Consider Input: Sentence: 'people seated on a table looking very happy'. Find frequency of the letter 'g'

Output: 1


Input: Consider Input: Sentence: 'the boy is determined to show everyone how good he is on his skateboard'. Find frequency of the letter 'v'


Output: 1