#include<bits/stdc++.h>
#define LL long long
using namespace std;
const int MxN=2002;
int n,at,bt;
int a[MxN],b[MxN];
char s[MxN][MxN];
template<class T>void read(T &x)
{
	x=0;int f=0;char ch=getchar();
	while(ch<'0' || ch>'9')f|=(ch=='-'),ch=getchar();
	while(ch>='0' && ch<='9')x=(x<<3)+(x<<1)+(ch^48),ch=getchar();
	x=f? -x:x;return ;
}
int main()
{
	for(;~scanf("%d",&n);)
	{
		at=bt=0;
		for(int i=1;i<=n;++i)scanf("%s",s[i]+1);
		for(int i=1;i<=n;++i)
		{
			if(!at)
			{
				a[++at]=i;
				continue;
			}
			if(!bt)
			{
				b[++bt]=i;
				continue;
			}
			if(s[a[at]][i]=='0')
			{
				a[++at]=i;
				continue;
			}
			if(s[b[bt]][i]=='1')
			{
				b[++bt]=i;
				continue;
			}
			if(s[a[at]][b[bt]]=='1')b[++bt]=a[at],b[++bt]=i,--at;
			else a[++at]=b[bt],a[++at]=i,--bt;
		}
		for(int i=1;i<=at;++i)printf("%d ",a[i]);
		for(int i=1;i<=bt;++i)printf("%d ",b[i]);
		puts("");
	}
	return 0;
}