#ifdef DEBUG
#define _GLIBCXX_DEBUG
#endif
//#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;

#define pb push_back

typedef long long ll;
typedef long double ld;
int n, k;
const int maxN = 505;
int g[maxN][maxN];
int h[maxN];
bool used[maxN];
void dfs(int v) {
    used[v] = true;
    if (h[v] % 2 == 0) cout << v << " ";
    for (int p = 1; p <= n; p++) {
        if (!used[p] && g[v][p]) {
            h[p] = h[v] + 1;
            dfs(p);
        }
    }
    if (h[v] % 2 == 1) cout << v << " ";
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
#ifdef DEBUG
    freopen("input.txt", "r", stdin);
#endif
    cin >> n >> k;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) {
            char c;
            cin >> c;
            if (c == '1') g[i][j] = 1;
        }
    }
    dfs(1);
    return 0;
}