#include <iostream>
#include <string>
using namespace std;

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