#include <bits/stdc++.h>
#include <cmath>

//using namespace boost::multiprecision;
using namespace std;
typedef long long ll;
//typedef unsigned long long ll;
const double EPS = 1e-9;
#define rep(i, n) for (int i = 0; i < (n); ++i)
//#define rep(i, n) for (ll i = 0; i < (n); ++i)
//#define sz(x) ll(x.size())
typedef pair<int, int> P;
//typedef pair<ll, int> P;
//typedef pair<ll, ll> P;
//const double INF = 1e10;
const ll INF = LONG_LONG_MAX / 100;
//const ll INF = (1ll << 31) - 1;
//const ll INF = 1e15;
const ll MINF = LONG_LONG_MIN;
//const int INF = INT_MAX / 10;
#define cmin(x, y) x = min(x, y)
#define cmax(x, y) x = max(x, y)
//typedef pair<int, int> P;
//typedef pair<double, double> P;
#define ret() return 0;

bool contain(set<char> &s, char a) { return s.find(a) != s.end(); }

//ifstream myfile("C:\\Users\\riku\\Downloads\\0_00.txt");
//ofstream outfile("log.txt");
//outfile << setw(6) << setfill('0') << prefecture << setw(6) << setfill('0') << rank << endl;
// std::cout << std::bitset<8>(9);
const int mod = 1000000007;
//const ll mod = 1e10;
typedef priority_queue<long long, vector<long long>, greater<long long> > PQ_ASK;

struct mint {
    ll x; // typedef long long ll;
    mint(ll x = 0) : x((x % mod + mod) % mod) {}

    mint &operator+=(const mint a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }

    mint &operator-=(const mint a) {
        if ((x += mod - a.x) >= mod) x -= mod;
        return *this;
    }

    mint &operator*=(const mint a) {
        (x *= a.x) %= mod;
        return *this;
    }

    mint operator+(const mint a) const {
        mint res(*this);
        return res += a;
    }

    mint operator-(const mint a) const {
        mint res(*this);
        return res -= a;
    }

    mint operator*(const mint a) const {
        mint res(*this);
        return res *= a;
    }

    mint pow(ll t) const {
        if (!t) return 1;
        mint a = pow(t >> 1);
        a *= a;
        if (t & 1) a *= *this;
        return a;
    }

    // for prime mod
    mint inv() const {
        return pow(mod - 2);
    }

    mint &operator/=(const mint a) {
        return (*this) *= a.inv();
    }

    mint operator/(const mint a) const {
        mint res(*this);
        return res /= a;
    }

    friend std::istream &operator>>(std::istream &in, mint &o) {
        ll a;
        in >> a;
        o = a;
        return in;
    }

    friend std::ostream &operator<<(std::ostream &out, const mint &o) {
        out << o.x;
        return out;
    }

};

int main() {
    int n;
    cin >> n;
    vector<int> numbers(n);
    rep(i, n) cin >> numbers[i];
    vector<int> ans;
    while (!numbers.empty()) {
        bool b = [&] {
            for (int i = numbers.size() - 1; i >= 0; i--) {
                if (numbers[i] == (i + 1)) {
                    ans.push_back(i + 1);
                    numbers.erase(numbers.begin() + i);
                    return true;
                }
            }
            return false;
        }();
        if (!b) {
            cout << -1 << endl;
            ret();
        }
    }
    reverse(ans.begin(), ans.end());
    for (int i : ans) cout << i << endl;

}


Measured memory_bytes: 256