v shirinu

#include <iostream>
#include <cstdlib>
#include <cstdio>

using namespace std;

int A[100001], a[150][150], pr[10001], d[100001], x, i, j, n, s, f, l, r;

bool was[100001];

int main () {

    //#ifndef ONLINE_JUDGE
    //freopen("a.in", "r", stdin);
    //freopen("a.out", "w", stdout);
    //#endif

    scanf ("%d", &n);

    for (i = 1; i <= n; i++)
        for (j = 1; j <= n; j++)
            scanf ("%d", &a[i][j]);

    scanf ("%d %d", &s, &f);

    l = r = 1;

    was[s] = true;
    d[l] = s;

    while (l <= r) {
        x = d[l];
        for (i = 1; i <= n; i++)
            if (!was[i] && a[x][i]) {
                was[i] = true;
                d[++r] = i;
                pr[i] = x;
            }
        l++;
    }

    if (!was[f]) {
        printf ("-1");
        exit(0);
    }
    i = 0;
    while (f) {
        A[++i] = f;
        f = pr[f];
    }

    printf ("%d\n", i - 1);

    for (j = i; j >= 1; j--)
        printf ("%d ", A[j]);

    return 0;

}