Problem: A substring of a string is a contiguous subsequence of that string. So, string bca is substring of string abcabc, but string cc is not.

A repeating block is a string formed by concatenating some string with itself. So, string abcabc is a repeating block, but strings abcabd, ababab are not.

You've got a sequence of Latin characters (string). At each step you find the shortest substring that is a repeating block, if there exists more than one you must choose the leftmost. As the substring is of form XX (X — some string) you replace this substring with X, in other words you delete one of the X substrings in the substring. You repeat this process until there remains no repeating block in the string. 

How would the final string looks like? Look at the sample explanation to understand the statement more precise.

Input

In the first line of input you're given a string of small Latin characters with length between 1 to 50000, inclusive.

Output

Print the final string after applying changes.

Examples

Input

abccabc


Output

abc


Input

aaaabaaab


Output

ab


Input

birdbirdbirdistheword


Output

birdistheword

Note

At the first sample the string transforms as follows: abccabc →  abcabc →  abc.

At the second sample the string transforms as follows: aaaabaaab →  aaabaaab →  aabaaab →  abaaab →  abaab →  abab →  ab.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const double eps = 1e-10;
vector<int> z_function(const string& s) {
  int n = (int)s.length();
  vector<int> z(n);
  for (int i = 1, l = 0, r = 0; i < n; ++i) {
    if (i <= r) z[i] = min(r - i + 1, z[i - l]);
    while (i + z[i] < n && s[z[i]] == s[i + z[i]]) ++z[i];
    if (i + z[i] - 1 > r) l = i, r = i + z[i] - 1;
  }
  return z;
}
const int maxn = 50001;
bool currentState;
struct segment_tree {
  int n;
  vector<int> t, a;
  segment_tree() {}
  segment_tree(int n) : n(n) {
    t.resize(4 * n, -1);
    a.resize(4 * n, 0);
  }
  void update(int v, int tl, int tr) {
    if (t[v] == -1) return;
    if (tl == tr)
      a[v] = t[v];
    else {
      a[v] = t[v] * (tr - tl + 1);
      t[v * 2] = t[v * 2 + 1] = t[v];
    }
    t[v] = -1;
  }
  void set(int v, int tl, int tr, int l, int r, int val) {
    update(v, tl, tr);
    if (l > r) return;
    if (l == tl && r == tr) {
      t[v] = val;
      update(v, tl, tr);
      return;
    }
    int tm = (tl + tr) / 2;
    set(v * 2, tl, tm, l, min(r, tm), val);
    set(v * 2 + 1, tm + 1, tr, max(l, tm + 1), r, val);
    a[v] = a[v * 2] + a[v * 2 + 1];
  }
  int get(int v, int tl, int tr, int l, int r) {
    update(v, tl, tr);
    if (l > r) return 0;
    if (l == tl && r == tr) return a[v];
    int tm = (tl + tr) / 2;
    return get(v * 2, tl, tm, l, min(r, tm)) +
           get(v * 2 + 1, tm + 1, tr, max(l, tm + 1), r);
  }
  void SET(int l, int r, int val) { set(1, 0, n - 1, l, r, val); }
  int GET(int l, int r) { return get(1, 0, n - 1, l, r); }
};
segment_tree T, T2;
void output_tandem(const string& s, int shift, bool left, int cntr, int l,
                   int l1, int l2) {
  int pos;
  if (left)
    pos = cntr - l1;
  else
    pos = cntr - l1 - l2 - l1 + 1;
  currentState = true;
  int ll = shift + pos, rr = shift + pos + 2 * l - 1;
  if (T.GET(ll, rr) == 0) T.SET(ll, rr, 1), T2.SET(ll, (ll + rr) / 2, 1);
}
void output_tandems(const string& s, int shift, bool left, int cntr, int l,
                    int k1, int k2) {
  int l1 = (l - k2 + k1) / 2;
  if (l1 <= k1 && l - l1 <= k2)
    output_tandem(s, shift, left, cntr, l, l1, l - l1);
}
inline int get_z(const vector<int>& z, int i) {
  return 0 <= i && i < (int)z.size() ? z[i] : 0;
}
void find_tandems(string s, int shift = 0) {
  int n = (int)s.length();
  if (n == 1) return;
  int nu = n / 2, nv = n - nu;
  string u = s.substr(0, nu), v = s.substr(nu);
  string ru = string(u.rbegin(), u.rend()), rv = string(v.rbegin(), v.rend());
  find_tandems(u, shift);
  find_tandems(v, shift + nu);
  vector<int> z1 = z_function(ru), z2 = z_function(v + '#' + u),
              z3 = z_function(ru + '#' + rv), z4 = z_function(v);
  for (int cntr = 0; cntr < n; ++cntr) {
    int l, k1, k2;
    if (cntr < nu) {
      l = nu - cntr;
      k1 = get_z(z1, nu - cntr);
      k2 = get_z(z2, nv + 1 + cntr);
    } else {
      l = cntr - nu + 1;
      k1 = get_z(z3, nu + 1 + nv - 1 - (cntr - nu));
      k2 = get_z(z4, (cntr - nu) + 1);
    }
    if (k1 + k2 >= l) output_tandems(s, shift, cntr < nu, cntr, l, k1, k2);
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  string s;
  cin >> s;
  T = segment_tree((int)s.length());
  T2 = segment_tree((int)s.length());
  do {
    currentState = false;
    T.SET(0, T.n - 1, 0);
    T2.SET(0, T.n - 1, 0);
    find_tandems(s);
    string ns = "";
    for (int i = 0; i < (int)s.length(); i++)
      if (T2.GET(i, i) == 0) ns += s[i];
    s = ns;
  } while (currentState);
  cout << s << endl;
}