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#include<bits/stdc++.h>

using namespace std;

#define PB push_back
#define MP make_pair
#define F first
#define S second
#define ALL(x) (x).begin(),(x).end()
#define SIZE(x) (int)(x).size()
#define CLEAR(tab) memset(tab, 0, sizeof(tab))
#define REP(x, n) for(int x = 0; x < (n); x++)
#define FOR(x, b, e) for(int x = (b); x <= (e); x++)
#define FORD(x, b, e) for(int x = (b); x >= (e); x--)
#define VAR(v, n) __typeof(n) v = (n)
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define DEBUG(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__)

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

const int MXN = 1000010;
const int C = 262144;
const int INF = 1000000001;

int main() {
	int n, cnt = 0;
	scanf("%d", &n);
	
	FOR(i, 1, n) {
		int x;
		scanf("%d", &x);
		if(x == 1)
				cnt++;
	}

	
	if(cnt >= 2)
		cnt = 2;
	printf("%d\n", 2 - cnt);
	printf("2\n1 2\n");
	return 0;
}