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#include <iostream>
#include  <cstdio>
using namespace std;

#define get getchar_unlocked

int Nscan()
{
	int n = 0, ch = 0;
	while (ch < '0' || ch > '9') ch = get();
	while ('0' <= ch && ch <= '9') {
		n = (n << 3) + (n << 1) + ch - '0';
		ch = get();
	}
	return n;
}

int main()
{
	std::ios_base::sync_with_stdio(false);  cin.tie(NULL);

	int q=2, n=Nscan(), a,b,c=0;
	while(n--)
	{	
		while(c<='0')  c=get();
		b=0;
		while(c>='0') { a=b; b=c; c=get(); }
		if((a==0)&&(b=='1'))
			if(!(--q)) break;
	}
	
	cout << q << "\n2\n1 2\n";
	
	return 0;
	
}