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

Input: Consider Input: Sentence: 'some food on plates next to each other on a table'. Find frequency of the letter 'e'

Output: 6


Input: Consider Input: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'

Output: 3


Input: Consider Input: Sentence: 'a tennis player that is running to get the tennis ball'. Find frequency of the letter 't'


Output: 7