#include <bits/stdc++.h>
#define maxN 5002
using namespace std;
int n, v[maxN], ans;
bool used[maxN];
vector < int > s;
struct piv
{
    int a, b, c;
} p[maxN];
int Min(int x, int y)
{
    if (x < y)
        return x;
    return y;
}

int Max(int x, int y)
{
    if (x > y)
        return x;
    return y;
}
void read()
{
    int i;
    freopen("sortare.in", "r", stdin);
    scanf("%d", &n);
    s.push_back(1);
    for (i = 2; i <= n; ++ i)
    {
        scanf("%d %d %d", &p[i].a, &p[i].b, &p[i].c);
        s.push_back(i);
    }
}
void sortp()
{
    int i, m, M;
    ans = 0;
    while (s.size() > 1)
    {
        ++ ans;
        int len = s.size();
        m = Min(Min(s[p[len].a - 1], s[p[len].b - 1]), s[p[len].c - 1]);
        M = Max(Max(s[p[len].a - 1], s[p[len].b - 1]), s[p[len].c - 1]);
        if (s[p[len].a - 1] != m && s[p[len].a - 1] != M)
            M = s[p[len].a - 1];
        else if (s[p[len].b - 1] != m && s[p[len].b - 1] != M)
            M = s[p[len].b - 1];
        else
            M = s[p[len].c - 1];
        if (p[len].a != p[len].b && p[len].b != p[len].c && p[len].c != p[len].a)
        {
            v[m] = len;
            v[M] = len - 1;
        }
        else
            v[M] = len;
        s.clear();
        for (i = 1; i <= n; ++ i)
            if (!v[i])
                s.push_back(i);
    }
    if (s.size())
    {
        ++ ans;
        v[s[0]] = 1;
    }
}
void solve()
{
    int i;
    sortp();
}
void write()
{
    int i;
    freopen("sortare.out", "w", stdout);
    printf("%d\n", ans);
    for (i = 1; i <= n; ++ i)
        printf("%d ", v[i]);
}
int main()
{
    read();
    solve();
    write();
    return 0;
}