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

#ifndef _WIN32
    #define getchar getchar_unlocked
#endif

#define MP make_pair
#define PB push_back
#define ST first
#define ND second
#define ALL(x) (x).begin(),(x).end()
#define SZ(x) ((int)(x).size())
//#define int LLI
#define FOR(i,a,b) for(int i = (a); i <= (b); ++i)
#define REP(i,n) FOR(i,0,(int)(n)-1)
#define F1(i,n) FOR(i,1,n)

typedef long long LLI;
typedef unsigned long long LLU;
typedef long double LD;
typedef pair<int, int> pii;
typedef pair<LLI, LLI> pll;
typedef vector<int> vi;

#ifdef ONLINE_JUDGE
ostream cnull(NULL);
#define cerr cnull
#endif

template<class TH> void _dbg(const char *sdbg, TH h){cerr<<sdbg<<"="<<h<<"\n";}
template<class TH, class... TA> void _dbg(const char *sdbg, TH h, TA... a) {
  while(*sdbg!=',') cerr<<*sdbg++;
  cerr<<"="<<h<<",";
  _dbg(sdbg+1, a...);
}
#define dbg(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#define dbgV(R) {cerr << #R << "=["; for(int e : R) cerr << e << ", "; cerr << "E]\n";}
#define dbgA(R, n) {cerr << #R << "=["; for(int i = 0; i <= n; ++i) cerr << R[i] << ", "; cerr << "E]\n";}
#define boost ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)

int32_t main()
{
    boost;
    int n; cin >> n;
    int liczek = 0;
    for(int i = 1; i <= n; ++i){
		int x; cin >> x;
		liczek += (x == 1);
	}
	cout << 2 - min(2, liczek) << "\n2\n1 2";
}