#include<bits/stdc++.h>
using namespace std;
mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());
uniform_int_distribution<> dis(0, 1e9);
signed main(){
    int n;
    cin>>n;
    vector<int> vec(n),arr(n);
    for(int &u:arr)
        cin>>u;
    iota(vec.begin(),vec.end(),0);
    for(int k=0;k<100;++k){
        bool cc=1;
        for(int i=0;i<n;++i){
            cc&=(arr[i]!=vec[i]);
        }
        if(cc){
            for(int i=0;i<n;++i){
                cout<<vec[i]<<" ";
            }   
            cout<<"\n";
            return 0;
        }
        shuffle(vec.begin(),vec.end(),mt);
    }
    cout<<"-1\n";
//try 3


}