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

Input: Consider Input: Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a bunch of fruit sitting in a bowl, its overflowing'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'woman sitting on luggage cart smiles up at the camera'. Find frequency of the letter 'n'


Output: 3