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

Input: Consider Input: Sentence: 'a gray colored pigeon that is perched on a railing outside of a building, with other buildings in the background'. Find frequency of the letter 'e'

Output: 7


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 smaller veggie pizza is ready to be eaten'. Find frequency of the letter 'e'


Output: 7