超级简单

#include <bits/stdc++.h>
using namespace std;
int top;
char ch[105];
string a;
int main() {
	getline(cin,a);
	for(int i = 0;i<a.length();i++){
		if(a[i] == '@')top = 0;
		else if(a[i] == '#'){
			if(top>0)top--;
		}
		else{
			top++;
			ch[top] = a[i];
		}
	}
	for(int i = 1;i<=top;i++)cout<<ch[i];
	return 0;
}