#include "doll.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> tii;
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define LSOne(s) ((s)&(-s))
ll INF=1e18+10;
int inf=1e9+10;
ll M=1e9+7;
void create_circuit(int M, std::vector<int> A) {
int n=A.size();
vi c,x,y;
vi a(M+1,0);
vii b(M+1);
REP(i,0,n)a[A[i]]++;
REP(i,0,n-1)b[A[i]].PB(A[i+1]);
b[A[n-1]].PB(0);
c.resize(M+1,0);
c[0]=A[0];
int k=0;
REP(i,1,M+1){
if(a[i]==0)continue;
if(a[i]==1)c[i]=b[i][0];
else if(a[i]==2){
c[i]=k-1;
k--;
x.PB(b[i][0]);
y.PB(b[i][1]);
}
else if(a[i]==3){
c[i]=k-1;
k--;
x.PB(k-1);
y.PB(k-2);
x.PB(k);
y.PB(b[i][1]);
x.PB(b[i][0]);
y.PB(b[i][2]);
k-=2;
}
else{
c[i]=k-1;
k--;
x.PB(k-1);
y.PB(k-2);
x.PB(b[i][0]);
y.PB(b[i][2]);
x.PB(b[i][1]);
y.PB(b[i][3]);
k-=2;
}
}
// for(auto u:c)cerr<<u<<" ";
// cerr<<"\n";
// for(auto u:x)cerr<<u<<" ";
// cerr<<"\n";
// for(auto u:y)cerr<<u<<" ";
// cerr<<"\n";
answer(c,x,y);
}
