下次python就不会找不到答案了

# 36直接进1 ，10是a，35是 z 
        n1, n2 = len(A)-1, len(B)-1
        carry = 0 
        res = ''
        while n1 >= 0 or n2 >= 0 or carry == 1:
            temp = carry 
            if n1 >= 0:
                ch = A[n1]
                if '0' <= ch <= '9':
                    temp += int(ch)
                else:
                    temp += ord(ch) - ord('a') + 10 
            if n2 >= 0:
                ch = B[n2]
                if '0' <= ch <= '9':
                    temp += int(ch)
                else:
                    temp += ord(ch) - ord('a') + 10 
            carry = temp // 36 
            temp %= 36 
            if temp > 9:
                res += chr(temp-10+ord('a'))
            else:
                res += str(temp)
            n1 -= 1
            n2 -= 1
        return res[::-1] # 结果要反转