func_code_string: #include <bits/stdc++.h>   using namespace std;   deque<char> D;   int main() {     int n;     cin >> n;     string s;     cin >> s;     for (int i = 0; i < n; i++)       if (D.size() % 2 == 0 || D.back() != s[i]) D.push_back(s[i]);     if (D.size() % 2 == 1) D.pop_back();     cout << n - D.size() << endl;     for (int i = 0; i < D.size(); i++) cout << D[i];     cout << endl;     return 0;   }   