Problem: According to an old legeng, a long time ago Ankh-Morpork residents did something wrong to miss Fortune, and she cursed them. She said that at some time n snacks of distinct sizes will fall on the city, and the residents should build a Snacktower of them by placing snacks one on another. Of course, big snacks should be at the bottom of the tower, while small snacks should be at the top.

Years passed, and once different snacks started to fall onto the city, and the residents began to build the Snacktower.

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However, they faced some troubles. Each day exactly one snack fell onto the city, but their order was strange. So, at some days the residents weren't able to put the new stack on the top of the Snacktower: they had to wait until all the bigger snacks fell. Of course, in order to not to anger miss Fortune again, the residents placed each snack on the top of the tower immediately as they could do it.

Write a program that models the behavior of Ankh-Morpork residents.

Input

The first line contains single integer n (1 ≤ n ≤ 100 000) — the total number of snacks.

The second line contains n integers, the i-th of them equals the size of the snack which fell on the i-th day. Sizes are distinct integers from 1 to n. 

Output

Print n lines. On the i-th of them print the sizes of the snacks which the residents placed on the top of the Snacktower on the i-th day in the order they will do that. If no snack is placed on some day, leave the corresponding line empty.

Examples

Input

3
3 1 2


Output

3
 
2 1

Input

5
4 5 1 2 3


Output

 
5 4
 
 
3 2 1

Note

In the example a snack of size 3 fell on the first day, and the residents immediately placed it. On the second day a snack of size 1 fell, and the residents weren't able to place it because they were missing the snack of size 2. On the third day a snack of size 2 fell, and the residents immediately placed it. Right after that they placed the snack of size 1 which had fallen before.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
const long long int oo = (long long int)1e18 + 10;
const int inf = 0x3f3f3f3f;
const double PHI = ((sqrt(5) + 1) / 2);
const double PI = acos(-1.0);
using namespace std;
long long int CEIL(long long int, long long int);
long long int FLOOR(long long int a, long long int b) {
  if (b < 0)
    return FLOOR(-a, -b);
  else if (a < 0)
    return -1 * CEIL(-a, b);
  else
    return a / b;
}
long long int CEIL(long long int a, long long int b) {
  if (b < 0)
    return CEIL(-a, -b);
  else if (a < 0)
    return -1 * FLOOR(-a, b);
  else
    return (a + b - 1) / b;
}
long long int gcd(long long int a, long long int b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
long long int lcm(long long int a, long long int b) {
  return (a * b) / gcd(a, b);
}
long long int exgcd(long long int a, long long int b, long long int &x,
                    long long int &y) {
  if (a == 0) {
    x = 0;
    y = 1;
    return b;
  }
  long long int xx, yy, g = exgcd(b % a, a, xx, yy);
  x = yy - (b / a) * xx;
  y = xx;
  return g;
}
int bin1(long long int x) {
  int r = 0;
  while (x) {
    r++;
    x &= x - 1;
  }
  return r;
}
long long int power(long long int b, long long int e) {
  if (e == 0) return 1;
  if (e % 2 == 0) return power(b * b, e / 2);
  return b * power(b * b, e / 2);
}
double powerf(double b, int e) {
  if (e == 0) return 1;
  if (e % 2 == 0)
    return powerf(b * b, e / 2);
  else {
    if (e > 0)
      return b * powerf(b * b, e / 2);
    else
      return powerf(b * b, e / 2) / b;
  }
}
long long int modpow(long long int b, long long int e, long long int m) {
  long long int r = 1;
  b = b % m;
  while (e > 0) {
    if (e % 2 == 1) r = (r * b) % m;
    e /= 2;
    b = (b * b) % m;
  }
  return r;
}
long long int modinverse(long long int a, long long int mod) {
  return modpow(a, mod - 2, mod);
}
long long int modinverse2(long long int a, long long int m) {
  long long int x, y;
  exgcd(a, m, x, y);
  while (x < 0) x += m;
  return x;
}
long long int nCrmod(long long int n, long long int r, long long int m) {
  if (r > n) r = n - r;
  long long int res = 1;
  for (long long int i = r; i >= 1; i--) {
    res = (res * (n - i + 1)) % m;
    res = (res * modinverse(i, m));
  }
  return res;
}
long long int nCr(long long int n, long long int r) {
  if (r > n) r = n - r;
  long long int res = 1;
  for (long long int i = r; i >= 1; i--) {
    res *= (n - i + 1);
    res /= i;
  }
  return res;
}
long long int totient(long long int n) {
  long long int res = n, p;
  for (p = 2; p * p <= n; p++) {
    if (n % p == 0) {
      while (n % p == 0) n /= p;
      res -= res / p;
    }
  }
  if (n > 1) res -= res / n;
  return res;
}
bool isprime(long long int x) {
  if (x == 1) return false;
  for (long long int i = 2; i * i <= x; i++)
    if (x % i == 0) return false;
  return true;
}
bool isvowel(char c) {
  if (isupper(c)) c = tolower(c);
  return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
}
bool istriangle(long long int a, long long int b, long long int c) {
  return (a + b > c) && (a + c > b) && (b + c > a);
}
long long int stringmod(string s, long long int mod) {
  long long int res = 0;
  for (unsigned int i = 0; i < s.size(); i++)
    res = (res * 10 + s[i] - '0') % mod;
  return res;
}
long long int powinfact(long long int n, long long int p) {
  long long int res = 0, pw = p;
  while (n >= pw) {
    res += (n / pw);
    pw *= p;
  }
  return res;
}
vector<vector<long long int> > matrixmultiply(vector<vector<long long int> > A,
                                              vector<vector<long long int> > B,
                                              long long int n) {
  vector<vector<long long int> > C(2, vector<long long int>(n));
  for (int i = 0; i < n; i++)
    for (int j = 0; j < n; j++)
      for (int k = 0; k < n; k++) C[i][j] = (C[i][j] + A[i][k] * B[k][j]);
  return C;
}
vector<vector<long long int> > modmatrixmultiply(
    vector<vector<long long int> > A, vector<vector<long long int> > B,
    long long int n, long long int mod) {
  vector<vector<long long int> > C(2, vector<long long int>(n));
  for (int i = 0; i < n; i++)
    for (int j = 0; j < n; j++)
      for (int k = 0; k < n; k++) C[i][j] = (C[i][j] + A[i][k] * B[k][j]) % mod;
  return C;
}
vector<vector<long long int> > powermatrix(vector<vector<long long int> > A,
                                           long long int exp, long long int n) {
  if (exp == 1) return A;
  if (exp % 2) return matrixmultiply(A, powermatrix(A, exp - 1, n), n);
  vector<vector<long long int> > X = powermatrix(A, exp / 2, n);
  return matrixmultiply(X, X, n);
}
vector<vector<long long int> > modpowmatrix(vector<vector<long long int> > A,
                                            long long int exp, long long int n,
                                            long long int mod) {
  if (exp == 1) return A;
  if (exp % 2)
    return modmatrixmultiply(A, modpowmatrix(A, exp - 1, n, mod), n, mod);
  vector<vector<long long int> > X = modpowmatrix(A, exp / 2, n, mod);
  return modmatrixmultiply(X, X, n, mod);
}
long long int merge(long long int a[], long long int l, long long int m,
                    long long int r) {
  long long int i = l, j = m + 1, k = 0, inv_cnt = 0, temp[r - l + 1];
  while (i <= m && j <= r) {
    if (a[i] <= a[j])
      temp[k++] = a[i++];
    else {
      temp[k++] = a[j++];
      inv_cnt += (m - i + 1);
    }
  }
  while (i <= m) temp[k++] = a[i++];
  while (j <= r) temp[k++] = a[j++];
  for (i = l; i <= r; i++) a[i] = temp[i - l];
  return inv_cnt;
}
long long int mergesort(long long int a[], long long int l, long long int r) {
  long long int inv_count = 0;
  if (l < r) {
    long long int m = (l + r) / 2;
    inv_count += mergesort(a, l, m);
    inv_count += mergesort(a, m + 1, r);
    inv_count += merge(a, l, m, r);
  }
  return inv_count;
}
double dist(long long int x1, long long int y1, long long int x2,
            long long int y2) {
  return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
}
void pre() {}
void gcj() {
  long long int t;
  cin >> t;
  for (long long int c = 1; c <= t; c++) {
    cout << "Case #" << c << ": " << endl;
  }
}
set<long long int> s;
void judge() {
  long long int n, curr, x;
  cin >> n;
  curr = n;
  for (long long int i = 0; i < n; i++) {
    cin >> x;
    s.insert(x);
    while (s.find(curr) != s.end()) {
      cout << curr << " ";
      curr--;
    }
    cout << endl;
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  pre();
  long long int tt = 1;
  while (tt--) {
    judge();
  }
  return 0;
}