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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
long gcd(long a, long b)
{
long c;
while (b) {
c = a % b;
a = b;
b = c;
}
return a;
}
int main()
{
char m, n, i, j, l, val0 = 0, *val;
long *k, *h, x, g;
scanf("%hhd %hhd", &m, &n);
val = malloc(n);
for (i = 0; i < n; i++)
val[i] = 1;
k = malloc(m * 4);
for (i = 0; i < m; i++)
scanf("%ld", &k[i]);
h = malloc(m * 4);
for (i = 0; i < n; i++) {
memcpy(h, k, m * 4);
for (j = 0; j < m; j++) {
scanf("%ld", &x);
for (l = 0; l < m && x > 1; l++) {
g = gcd(h[l], x);
h[l] /= g;
x /= g;
}
if (x > 1) {
val[i] = 0;
for (j++; j < m; j++)
scanf("%ld", &x);
break;
}
}
if (val[i])
val0++;
}
printf("%hhd\n", val0);
for (i = 0; i < n; i++)
if (val[i])
printf("%hhd ", i + 1);
puts("\b");
return 0;
}
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