"""
整数倒序
"""
def reversal_int1(i):
    res=0
    while i !=0:
        # 求出最后一位数字
        last = i % 10
        resnew=res*10+last
        if (resnew - last) / 10 != res:
            return 0
        res=resnew
        #去除最后一位数
        i = int(i / 10)
    print(res)

if __name__ == '__main__':
    i=1872030
    reversal_int1(i)