题解

#include <bits/stdc++.h>
using namespace std;
int main(){
string s1="";
string s;
cin>>s;
for(int i=0;i<s.size();i++)
{
if(s[i]=='@')
{
if(s1.size()>=1)
s1.erase(s1.size()-1,1);
}
else
s1+=s[i];
}
cout<<s1<<endl;
return 0;
}