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

Input: Consider Input: Sentence: 'a family sitting at a table in a restaurant looking at their phones'. Find frequency of the letter 't'

Output: 8


Input: Consider Input: Sentence: 'a closeup view of a bathroom sink, that is very modern'. Find frequency of the letter 'e'

Output: 4


Input: Consider Input: Sentence: 'several people in river climbing on top of elephants'. Find frequency of the letter 'l'


Output: 4