//#pragma GCC optimize ("Ofast")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#define pb push_back
#define F first
#define S second
#define ins insert
#define mp make_pair
#define fo(i, n1, n, x) for(int i = n1; i <= n; i += x)
#define foo(i, n, n1, x) for(int i = n; i >= n1; i -= x)
#define bit __builtin_popcount
#define md (l + ((r - l) / 2))
#define all(x) x.begin(),x.end()
#define eb emplace_back
#define ub upper_bound
#define lb lower_bound
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)

using namespace std;
//using namespace __gnu_pbds;
//using namespace __gnu_cxx;


using ll = long long;

//#define int ll

using pii = pair<int,int>;
using pll = pair<ll,ll>;
using vi = vector<int>;



const int N = 2e5 + 11, mod = 1e9 + 7, mod2 = 998244353;
const int MAX = 1e5 + 11;
const int INF1 = 2e9 + 11;
const ll INF2 = 6e18 + 11;
const double INF3 = 1e8 + 11;
const int base = 500;
const int P = 31;
const int dx[] = {1, -1, 0, 0, 1, 1, -1, -1};
const int dy[] = {0, 0, 1, -1, 1, -1, 1, -1};
const double EPS = 1e-4;
const double PI = acos(-1.0);


//template<typename T> using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T1, typename T2> inline void chmin(T1 &a, T2 b) { if (a > b) a = b; }
template<typename T1, typename T2> inline void chmax(T1 &a, T2 b) { if (a < b) a = b; }


mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l, int r) { return uniform_int_distribution<int> (l, r)(rng); }

string s;
main() {
  file("paint");
  ios;
  cin >> s;
  deque <char> d;
  bool t = 0;
  for (char it : s) {
    if (it == 'R') t ^= 1;
    else {
      if (!t) d.push_back(it);
      else d.push_front(it);
    }
  }
  stack <char> st;
  string ans = "";
  while (!d.empty()) {
    char x;
    if (!t) x = d.front(), d.pop_front();
    else x = d.back(), d.pop_back();
    if (ans.size() and ans.back() == x) ans.pop_back();
    else ans += x;
  }
  cout << ans;
  return 0;
}
/**

*/

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

#define rep2(i,k,n) for(i64 i=(i64)(k);i<(i64)(n);i++)
#define rep(i,n) rep2(i,0,n)
#define all(x) begin(x),end(x)
#ifdef ENV_LOCAL
#define dump if (1) cerr
#else
#define dump if (0) cerr
#endif
 
using namespace std;
using namespace std::string_literals;
 
using i32 = int32_t;
using i64 = int64_t;
using f64 = double;
using f80 = long double;
using vi32 = vector<i32>;
using vi64 = vector<i64>;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  string s;
  cin>>s;
  deque<char> q;
  bool rev = false;
  for (auto&& ch : s) {
    if (ch == 'R') rev = !rev;
    else {
      if (rev) q.push_front(ch);
      else q.push_back(ch);
    }
  }
  if (rev) {
    reverse(all(q));
  }
  vector<char> ans;
  for (auto&& ch : q) {
    if (ans.empty() || ans.back() != ch) {
      ans.push_back(ch);
    } else {
      ans.pop_back();
    }
  }
  for(auto&& ch : ans) {
    cout<<ch;
  }
  cout<<endl;
  return 0;
}
