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

Input: Consider Input: Sentence: 'a small white plane sitting on top of the ocean'. Find frequency of the letter 'e'

Output: 4


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

Output: 4


Input: Consider Input: Sentence: 'bridal party seated at table with food and red wine'. Find frequency of the letter 't'


Output: 5