func_code_string: #include <bits/stdc++.h>   using namespace std;   long long power(long long a, long long b) {     long long ans = 1;     while (b > 0) {       if (b & 1) {         ans = (ans * a) % 1000000007;       }       a = (a * a) % 1000000007;       b >>= 1;     }     return ans;   }   bool prime(long long n) {     for (long long i = 2; i * i <= n; i++) {       if (n % i == 0) return false;     }     return true;   }   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long n;     cin >> n;     long long a[n];     for (long long i = 0; i < n; i++) {       cin >> a[i];     }     long long i = 0;     long long x = 1;     bool b = true;     vector<long long> v;     while (i < n) {       if (a[i] == x) {         v.push_back(2001 + i);         b = false;         x++;         i++;       } else         i++;     }     cout << v.size() << endl;     for (long long i = 0; i < v.size(); i++) cout << v[i] <<    ;     return 0;   }   