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#include <bits/stdc++.h>
using namespace std;

int main() {
  int n;
  scanf("%d", &n);
  int ones = 0;
  while (n--) {
    int a;
    scanf("%d", &a);
    ones += a == 1;
  }
  printf("%d\n", max(0, 2 - ones));
  printf("2\n1 2\n");
  return 0;
}