#include <stdio.h>

long i, n, a[5010], b[5010], c[5010], puteri[] = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192};

int main()
{
    freopen ("sortare.in", "rt", stdin);
    freopen ("sortare.out", "wt", stdout);
    
    scanf("%ld", &n);
    for (i = 1; i <= n; ++i)
        scanf("%ld %ld %ld", &a[i], &b[i], &c[i]);
    
    i = 0;
    while (puteri[i] <= n)
          ++i;
          
    printf("%ld\n", i);
    
    for (i = 1; i <= n; ++i)
        printf("%ld ", i);
    printf("\n"); 
    
    return 0;
}