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#include<string>
#include<stack>
#include<iostream>
std::string removeStars(const std::string& s) {
std::stack<char> st;
for (int i = 0; i < s.size(); i++) {
if (s[i] == '*') {
if (st.empty())
throw "invalid expr";
else
st.pop();
}
else
st.push(s[i]);
}
std::string res(st.size(), '\0');
size_t idx = st.size() - 1;
while (!st.empty()) {
res[idx--] = st.top();
st.pop();
}
return res;
}
int main() {
}
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