>>> ord('0')
48
 
>>> ord('A')
65
 
>>> ord('a')
97

class Solution(object):
    def findAnagrams(self, s, p):
        """
        :type s: str
        :type p: str
        :rtype: List[int]
        """
        result = []
        record_s = [0]*26
        record_p = [0]*26
        if len(s) < len(p):
            return result
        for i in range(len(p)):
            record_s[ord(s[i])-ord('a')] += 1
            record_p[ord(p[i])-ord('a')] += 1
        if record_s == record_p:
            result.append(0)
        for i in range(len(s)-len(p)):
            record_s[ord(s[i])-ord('a')] -= 1
            record_s[ord(s[i+len(p)])-ord('a')] += 1
            if record_s == record_p:
                result.append(i+1)
        return result