#include <iostream>
using namespace std;
int main()
{
    string str;
    while(cin>>str)
    {
        for(int i=0;i<str.length();++i){
            if(str[i]=='@'){
                for(int j=0;j<str[i+1]-'0';++j){
                    cout<<str[i+2];
                }
                i+=3;
            }
            if(str[i]!='@'){
                cout<<str[i];
            }
        }
        cout<<endl;
    }
}