import math
class Solution:
    def reverse(self, y):
        """
        :type x: int
        :rtype: int
        """
        if y == 0: return 0
        elif y > 0: x = y
        else: x = -y
        l = [0]*10
        ans = 0
        indlist = list(range(0,10))
        for ind in indlist:
            l[ind] = x%10
            x = int(x/10)
        for ind_r in indlist[::-1]:
            if l[ind_r]!=0:
                for ind_rs in indlist[ind_r::-1]:
                    ans = (ans+l[ind_rs])/10
                if ans <= 0.2147483647 or ind_r is not 9:
                    if y>0:
                        return round(ans*10**(ind_r+1))
                    else:
                        return round(-ans*10**(ind_r+1))
                    break
                else:
                    return 0
                    break

test = Solution()
print(Solution.reverse(test, 123))