#include<bits/stdc++.h>

using namespace std;

string s, shi;
int main() {
	int n;
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> shi;
		if (shi == "<bs>") {
			if (!shi.empty())
				s.pop_back();
		} else
			s += shi;
	}
	cout << s;
	return 0;
}

当我输入

1
<bs>

时，输出一大堆奇怪的东西······