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OI-codes/XJOI/contest/21med/A/A.cpp

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#include <bits/stdc++.h>
using namespace std;
int n, p;
string s;
stack<int> st;
int main() {
cin >> n >> p >> s;
s = ' ' + s;
for (int i = 1; i < s.size(); i++) {
if (s[i] == '{') {
st.push(i);
} else if (st.top() == p) {
cout << i << endl;
exit(0);
} else if (i == p) {
cout << st.top() << endl;
exit(0);
} else {
st.pop();
}
}
return 0;
}