//#define _CRT_SECURE_NO_DEPRECATE
//#include<stdio.h>
//#include<stdlib.h>

#include <iostream>
#include <vector>

using namespace std;
int n; 
vector <int>  takoses;

void readinput()
{
    //read input data
    cin >> n;

    int a = 0;
    int b = 0;
    for (int i = 0; i < n; i++)
    {
        cin >> a;
        takoses.push_back(a);
    }

    for (int i = 0; i < n; i++)
    {
        a = takoses[i];
        for (int z = b; z < 1000000;z++) {
            if (z != a)
            {
                cout << z << " ";
                b = z;
                break;
            }  
        }
    }
}

int main()
{
    freopen("prefmex.in", "r", stdin);
    freopen("prefmex.out", "w", stdout);
    readinput();
}