#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define rrep(i,n) for(int (i)=((n)-1);(i)>=0;(i)--)
#define itn int
#define miele(v) min_element(v.begin(), v.end())
#define maele(v) max_element(v.begin(), v.end())
#define SUM(v) accumulate(v.begin(), v.end(), 0LL)
#define lb(a, key) lower_bound(a.begin(),a.end(),key)
#define ub(a, key) upper_bound(a.begin(),a.end(),key)
#define COUNT(a, key) count(a.begin(), a.end(), key) 
#define BITCOUNT(x) __builtin_popcount(x)
#define pb emplace_back
#define all(x) (x).begin(),(x).end()
#define F first
#define S second
using P = pair <int,int>;
using WeightedGraph = vector<vector <P>>;
using UnWeightedGraph = vector<vector<int>>;
const long long INF = 1LL << 60;
const int MOD = 1000000007;
void YN(bool flg) {cout<<(flg?"YES":"NO")<<'\n';}
void Yn(bool flg) {cout<<(flg?"Yes":"No")<<'\n';}
void yn(bool flg) {cout<<(flg?"yes":"no")<<'\n';}
template <typename T> 
int getIndexOfLowerBound(vector <T> &v, T x){
    return lower_bound(v.begin(),v.end(),x)-v.begin();
}
template <typename T> 
int getIndexOfUpperBound(vector <T> &v, T x){
    return upper_bound(v.begin(),v.end(),x)-v.begin();
}
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
#define DUMPOUT cerr
#define repi(itr, ds) for (auto itr = ds.begin(); itr != ds.end(); itr++)
template <typename T, typename U>
istream &operator>>(istream &is, pair<T,U> &p_var) {
    is >> p_var.first >> p_var.second;
    return is;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &vec) {
    for (T &x : vec) is >> x;
    return is;
}
template <typename T>
istream &operator>>(istream &is, vector<vector<T>> &df) {
    for(int i=0;i<df.size();i++)for(int j=0;j<df[i].size();j++)
    is >> df[i][j];
    return is;
}
template <typename T, typename U>
ostream &operator<<(ostream &os, pair<T, U> &pair_var) {
    DUMPOUT<<'{';
    os << pair_var.first;
    DUMPOUT<<',';
    os << " "<< pair_var.second;
    DUMPOUT<<'}';
    return os;
}
template <typename T>
ostream &operator<<(ostream &os, vector<T> &vec) {
    DUMPOUT<<'[';
    for (int i = 0; i < vec.size(); i++) 
    os << vec[i] << (i + 1 == vec.size() ? "" : " ");
    DUMPOUT<<']';
    return os;
}
template <typename T>
ostream &operator<<(ostream &os, vector<vector<T>> &df) {
  for (auto& vec : df) os<<vec;
  return os;
}
template <typename T, typename U>
ostream &operator<<(ostream &os, map<T, U> &map_var) {
    DUMPOUT << "{";
    repi(itr, map_var) {
        os << *itr;
        itr++;
        if (itr != map_var.end()) DUMPOUT << ", ";
        itr--;
    }
    DUMPOUT << "}";
    return os;
}
template <typename T>
ostream &operator<<(ostream &os, set<T> &set_var) {
    DUMPOUT << "{";
    repi(itr, set_var) {
        os << *itr;
        itr++;
        if (itr != set_var.end()) DUMPOUT << ", ";
        itr--;
    }
    DUMPOUT << "}";
    return os;
}
void print() {cout << endl;}
template <class Head, class... Tail>
void print(Head&& head, Tail&&... tail) {
  cout << head;
  if (sizeof...(tail) != 0) cout << " ";
  print(forward<Tail>(tail)...);
}
void dump_func() {DUMPOUT << '#'<<endl;}
template <typename Head, typename... Tail>
void dump_func(Head &&head, Tail &&... tail) {
    DUMPOUT << head;
    if (sizeof...(Tail) > 0) DUMPOUT << ", ";
    dump_func(std::move(tail)...);
}
#ifdef DEBUG_
#define DEB
#define dump(...)                                                              \
    DUMPOUT << "  " << string(#__VA_ARGS__) << ": "                            \
            << "[" << to_string(__LINE__) << ":" << __FUNCTION__ << "]"        \
            << endl                                                            \
            << "    ",                                                         \
        dump_func(__VA_ARGS__)
#else
#define DEB if (false)
#define dump(...)
#endif
string s; 
vector <int> dp(114514);
struct KMP{
    vector <int> table;
    string p;
    int sz;
    KMP(string S){ //探したいword, pattern
        sz = S.size();
        p = S;
        table.resize(sz+1);
        int j = table[0] = -1;
        for (int i = 0; i < S.size(); i++) {
            while (j >= 0 && S[i] != S[j]) j = table[j];
            j++;
            //table[i+1] = j;
            if (S[i+1] == S[j]) table[i+1] = table[j]; 
            else table[i+1] = j;
        }
        //rep(i, table.size()) cout<<table[i]<<endl;
    }
    vector <pair<int,int>> findfrom(string t) { //text
        int n = t.size();
        //int count = 0; 数を調べるだけなら
        vector <pair<int,int>> data;
        for (int i = 0, k = 0; i < n; ++i) {
            while (k >= 0 && p[k] != t[i]) k = table[k];
            if (++k >= sz) {
                data.push_back({i-sz+1,i});
                k = table[k];
                //count++;
            }
        }
        return data; //0indexed 
    }
};
vector <vector<int>> data;
void f(vector <pair<int,int>> &p){
    rep(i, p.size()){
        data[p[i].F].pb(p[i].S);
    }
}

vector <int> vis;
void dfs(int now = 0){
    dump(now);
    if(vis[now]) return ;
    else vis[now] = true;
    rep(i, data[now].size()){
        if(vis[data[now][i]+1]) continue;
        if(data[now][i] == s.size()-1){
            print("YES"); exit(0);
        }
        dfs(data[now][i]+1);
    }
}
signed main(void) { cin.tie(0); ios::sync_with_stdio(false);
    cin>>s;
    data.resize(s.size()), vis.resize(s.size()+10);
    if(s.size()==1) {print("NO"); return 0;}
    KMP kmp1("dream"), kmp2("dreamer"), kmp3("erase"), kmp4("eraser");
    
    auto data1 = kmp1.findfrom(s);
    auto data2 = kmp2.findfrom(s);
    auto data3 = kmp3.findfrom(s);
    auto data4 = kmp4.findfrom(s);
    dump(data1, data2, data3, data4);
    f(data1), f(data2), f(data3), f(data4);
    dump(data);
    dfs();
    YN(vis[s.size()]);
}


Measured memory_bytes: 5964