1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
#include <bits/stdc++.h>

#define mp make_pair
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(),(x).end()

using namespace std;

typedef long long LL;
typedef pair<int,int> PII;
typedef vector < int > VI;
typedef double D;

const int MN = 100005, inf = 1000000005, mod = 1000000007;
const LL INF = 1000000000000000005LL;


int main()
{
	int n, ans = 2;
	scanf("%d", &n);
	for(int i = 1; i <= n; ++i)
	{
		int c;
		scanf("%d", &c);
		if(c == 1)
			--ans;
	}
	ans = max(ans, 0);
	printf("%d\n", ans);
	printf("2\n1 2");
}