#include<bits/stdc++.h>
using namespace std;
string y = "";
int len=0;
string jy(int i) {
	string ans = "";
	if (y[i] == '[') {
		int t=0;
		i++;
		while(y[i]<'9'&&y[i]>'0'){
			t=t*10+y[i]-'0';
				i++;
		}
		string a = jy(i);
		for (int i = 1; i <= t; i++) {
			ans += a;
		}
		return ans;

	} else {
		int j = i;
		while (y[j] != ']') {
			ans += y[j];
			j++;
		}
		len=j;	
		//cout<<ans<<endl;
		return ans;

	}
}
int main() {
	cin >> y;

	for (int i = 0; i < y.size(); i++) {
		char a = y[i];
		if (a == ']')continue;
		if (a == '\n' || a == ' ')continue;
		if (a != '[') {
			cout << a;
		} else {
			cout << jy(i);
			i+=len;
		}
	}
}