#include <bits/stdc++.h>
using namespace std;

int main()
{
  string str;

  while (cin >> str){
    for (int i = 0; i < str.size(); i++){
      if (str[i] == '@'){
        for (int j = 0; j < str[i + 1] - '0'; j++){
          cout << str[i + 2];
        }
        i += 2;
      }
      else {
        cout << str[i];
      }
    }
    cout << endl;
  }
}