func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     vector<int> years;     int curr = 1;     for (int i = 1; i <= n; ++i) {       int x;       cin >> x;       if (x == curr) {         ++curr;         years.push_back(2000 + i);       }     }     cout << years.size() << endl;     for (int year : years) {       cout << year <<    ;     }   }   