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#include <bits/stdc++.h>
using namespace std;
ifstream r("sortare.in");
ofstream w("sortare.out");
int n, v[5005][3], maxim, solutie[5005];
void solve(int poz,int x)
{
int i=0;
while(poz)
{
if(solutie[i+1]==0)--poz;
i++;
}
solutie[i]=x;
}
int main()
{
r>>n;
int m=n;
for(int i=2; i<=n; ++i)
{
r>>v[i][0]>>v[i][1]>>v[i][2];
sort(v[i],v[i]+3);
}
while(n>1)
{
maxim++;
if(v[n][0]==v[n][1]||v[n][1]==v[n][2])
{
solve(v[n][1],n);
n-=1;
}
else
{
solve(v[n][2],n);
solve(v[n][1],n-1);
n-=2;
}
}
if(n==1)
{
solve(1,1);
}
w<<maxim+1<<"\n";
for(int i=1; i<=m; ++i)
{
w<<solutie[i]<<" ";
}
return 0;
}