
#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;
int main(){
  string s;
  int a;
  while(cin>>s){
    for(int i=0;i<s.size();i++){
      if(s[i]=='@'){
	a = s[i+1]-'0';
	for(int j=0;j<a;j++){
	  cout<<s[i+2];
	}
	i += 2;
      }
      else cout<<s[i];
    }
    cout<<endl;
  }
}