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
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
#include <bits/stdc++.h>
#include <random>
#include <ext/pb_ds/assoc_container.hpp>
//using namespace __gnu_pbds;
using namespace std;
#define ff first
#define dd second
#define mp make_pair
#define lld long long
#define pb emplace_back
#define sz size()
#define For(i,s,a) for(int i=(int)s;i<(int)a;++i)
#define pii pair<int,int>
#define pll pair<lld,lld>
#define rpt(S,it) for(auto it=S.begin();it!=S.end();++it)
#define mod (lld)(1e9+7)
#define scanf(...) scanf(__VA_ARGS__)?:0
#define P first
#define S second
#ifdef __WIN32__
#define gcx getchar
#elif __linux__
#define gcx getchar_unlocked
#endif
#define piii pair<pii,pii>
//template<typename T>
#define T int
inline void scan(T *i)
{
	register T t=0;
	register char z='a';
	register bool neg=0;
	while(z<'0' || z>'9'){if(z=='-')neg^=1;
	z=gcx();}
	while(z>='0' && z<='9')
	{
		t=(t<<3ll)+(t<<1ll)+z-'0';
		z=gcx();
	}
	if(neg)t=~(t-1);
	*i=t;
}

int c[1000001];

int main()
{
	int a;
	scanf("%d", &a);
	For(i,0,a)
	scanf("%d", &c[i]);
	sort(c,c+a);
	if(c[0]==1 && c[1]==1)
	{
		puts("0\n2\n1 2");
	}
	else
	if(c[0]==1)
	{
		puts("1\n2\n1 2");
	}
	else
	puts("2\n2\n1 2");
}