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

Input: Consider Input: Sentence: 'a picture of a machine built next to a street'. Find frequency of the letter 'x'

Output: 1


Input: Consider Input: Sentence: 'a white and blue plate topped with meat and a salad'. Find frequency of the letter 'u'

Output: 1


Input: Consider Input: Sentence: 'a woman holds a pole near two cows and a dog'. Find frequency of the letter 'o'


Output: 6