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#include <bits/stdc++.h>

using namespace std;


int main() {
#ifndef DEBUG
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
#endif
  
  int n;
  cin >> n;
  
  int ones = 0;
  
  while(n --> 0) {
    char t[8];
    cin >> t;
    if(t[0] == '1' and t[1] == '\0') {
      ones++;
      if(ones == 2) break;
    }
  }
  
  cout << 2 - ones << "\n2\n1 2\n";
  
  return 0;
}