poj 3077 Rounders

#include <iostream>
#include <string>
using namespace std;
int main()
{
    int n;string str;
    cin>>n;
    while(n--)
    {
        cin>>str;
        if(str.size()==1)
        {
            cout<<str<<endl;continue;
        }
        int tag=0;
        for(int i=str.size()-1;i>=1;--i)
        {
            if(str[i]>'4'||(tag==1&&str[i]=='4'))
                tag=1;
            else 
                tag=0;
        }
        str[0]=str[0]+tag;
        cout<<int(str[0]-'0');
        for(int i=1;i<str.size();++i)
            cout<<"0";
        cout<<endl;
    }
    return 0;
}