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

Input: Consider Input: Sentence: 'a man in a sweatshirt is taking his own picture'. Find frequency of the letter 'u'

Output: 1


Input: Consider Input: Sentence: 'two men with colorful ties are posing for a picture'. Find frequency of the letter 'r'

Output: 4


Input: Consider Input: Sentence: 'the bathroom is in need of remodel'. Find frequency of the letter 'e'


Output: 5