#include <bits/stdc++.h>
using namespace std;
inline char read() {
  static const int IN_LEN = 1000000;
  static char buf[IN_LEN], *s, *t;
  return (s == t               ? t = (s = buf) + fread(buf, 1, IN_LEN, stdin),
          (s == t ? -1 : *s++) : *s++);
}
template <class T>
inline void read(T &x) {
  static bool iosig;
  static char c;
  for (iosig = false, c = read(); !isdigit(c); c = read()) {
    if (c == '-') iosig = true;
    if (c == -1) return;
  }
  for (x = 0; isdigit(c); c = read()) x = ((x + (x << 2)) << 1) + (c ^ '0');
  if (iosig) x = -x;
}
const int OUT_LEN = 10000000;
char obuf[OUT_LEN], *ooh = obuf;
inline void print(char c) {
  if (ooh == obuf + OUT_LEN) fwrite(obuf, 1, OUT_LEN, stdout), ooh = obuf;
  *ooh++ = c;
}
template <class T>
inline void print(T x) {
  static int buf[30], cnt;
  if (x == 0)
    print('0');
  else {
    if (x < 0) print('-'), x = -x;
    for (cnt = 0; x; x /= 10) buf[++cnt] = x % 10 + 48;
    while (cnt) print((char)buf[cnt--]);
  }
}
inline void flush() { fwrite(obuf, 1, ooh - obuf, stdout); }
const int N = 105;
int n, r, ans, vis[N], a[N], q[N], s[N][N];
int main() {
  read(n);
  for (int i = (1); i <= (n); ++i)
    for (int j = (1); j <= (n); ++j) {
      while (isspace(s[i][j] = read()))
        ;
      s[i][j] ^= '0';
    }
  for (int i = (1); i <= (n); ++i) {
    read(a[i]);
    if (!a[i]) q[++r] = i;
  }
  for (int i = (1); i <= (r); ++i)
    if (!a[q[i]]) {
      for (int j = (1); j <= (n); ++j)
        if (!(a[j] -= s[q[i]][j]) && s[q[i]][j]) q[++r] = j;
      vis[q[i]] = 1;
      ++ans;
    }
  printf("%d\n", ans);
  for (int i = (1); i <= (n); ++i)
    if (vis[i]) printf("%d ", i);
  return 0;
}
