/**
III U U N N DDDD EEEEE RRRR SSSS TTTTT AAAAA N N DDDD I TTTTT N N OOO W W
I U U NN N D D E R R S T A A NN N D D I T NN N O O W W
I U U N N N D D EEEE RRRR SSSS T AAAAA N N N D D I T N N N O O W W W
I U U N NN D D E R R S T A A N NN D D I T N NN O O WW WW
III UUUUU N N DDDD EEEEE R R SSSS T A A N N DDDD I T N N OOO W W
**/
#include <bits/stdc++.h>
using namespace std;
#define ent '\n'
#define F first
#define S second
#define in insert
#define no "NO\n"
#define yes "YES\n"
#define pb push_back
#define sz(w) w.size()
#define int long long
#define all(w) w.begin(), w.end()
#define BakTR ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
const int MOD = 998244353, N = 2e5 + 7 , inf = 1e9 + 7, INF = 2e18, LOG = 20 , mod = 1e6 + 7 ;
void accepted() {
int n ;
cin >> n ;
int a[n + 1] ;
map <int , int> last ;
for(int i = 1 ; i <= n ; i++) {
cin >> a[i] ;
last[a[i]] = i ;
}
int j = 1 ;
for(int i = 1 ; i <= n ; i++) {
cout << a[j] << ent ;
if(a[i] == a[j]) {
if(last[a[i]] == i) {
j = i + 1 ;
}
}
}
}
signed main() {
BakTR
//PLS NeverGiveUp
//freopen("input.txt", "r", stdin) ;
//freopen("output.txt", "w", stdout) ;
int T = 1 ;
//cin >> T ;
while (T--) {
accepted();
cout << ent;
}
}
/**
baktr
65868073990A98C52AFDB7A48F4E8D26
**/
