#include <iostream> #include <string> using namespace std;  int main() {   string s;   int len,factor=17,num;   bool sign;//用來標志輸入字符串是否非法   while(cin>>s)   {     len = s.size();     sign =1;     num=0;      for(int i=0;i<len;i++)     {       if(s[i]>='0'&&s[i]<='9')              num=num*factor+(s[i]-'0');        else if(s[i]>='A'&&s[i]<='H')         num=num*factor+(s[i]-'A'+10);        else       {         sign=0;         break;       }     }      if (sign)       cout<<num<<endl;     else       cout<<"Error Input!"<<endl;   }   return 0; }