Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
def resolve():
    S=input()
    n=len(S)
    A="dream dreamer erase eraser".split()
    F=A[:]
    for a in A:
        for b in A:
            F.append(a+b)
    
    #print(F)
    #print(A)
    global cond
    cond=[]
    def dfslike_dreameraser(varS):#string->bool,resursion
        #print(varS)
        if len(varS)==0:
            cond.append(1)
            return 
        for word in reversed(F):
            if varS[:len(word)]==word:
                dfslike_dreameraser(varS[len(word):])
        return 
        
    dfslike_dreameraser(S)
    #print(cond)
    print(["NO","YES"][cond!=[]])
#%%submit!
resolve()

Fixed submission:
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
import random
def resolve():
    
    S=input()
    A="dream dreamer erase eraser".split()
    #print(A)
    que=[S]
    while(que!=[]):
        t=len(que)
        #print(t)
        vS=que.pop(random.randint(0,t-1))
        if vS=="":
            print("YES")
            return
        for w in A:
            r=len(w)
            if vS[:r]==w:
                que.append(vS[r:])
        #print(que,"k")    

    print("NO")
#%%submit!
resolve()

Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
def resolve():
    S=input()
    n=len(S)
    A="dream dreamer erase eraser".split()
    F=A[:]
    for a in A:
        for b in A:
            F.append(a+b)
    #print(F)
    #print(A)
    global cond
    cond=[]
    def dfslike_dreameraser(varS):#string->bool,resursion
        #print(varS)
        if len(varS)==0:
            cond.append(1)
            return 
        for word in F:
            if varS[:len(word)]==word:
                dfslike_dreameraser(varS[len(word):])
        return 
        
    dfslike_dreameraser(S)
    #print(cond)
    print(["NO","YES"][cond!=[]])
#%%submit!
resolve()

Fixed submission:
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
import random
def resolve():
    
    S=input()
    A="dream dreamer erase eraser".split()
    #print(A)
    que=[S]
    while(que!=[]):
        t=len(que)
        #print(t)
        vS=que.pop(random.randint(0,t-1))
        if vS=="":
            print("YES")
            return
        for w in A:
            r=len(w)
            if vS[:r]==w:
                que.append(vS[r:])
        #print(que,"k")    

    print("NO")
#%%submit!
resolve()

Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
import random
def resolve():
    
    S=input()
    A="dream dreamer erase eraser".split()
    #print(A)
    que=[S]
    while(que!=[]):
        t=len(que)
        print(t)
        vS=que.pop(random.randint(0,t-1))
        if vS=="":
            print("YES")
            return
        for w in A:
            r=len(w)
            if vS[:r]==w:
                que.append(vS[r:])
        print(que,"k")    

    print("NO")
#%%submit!
resolve()

Fixed submission:
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
import random
def resolve():
    
    S=input()
    A="dream dreamer erase eraser".split()
    #print(A)
    que=[S]
    while(que!=[]):
        t=len(que)
        #print(t)
        vS=que.pop(random.randint(0,t-1))
        if vS=="":
            print("YES")
            return
        for w in A:
            r=len(w)
            if vS[:r]==w:
                que.append(vS[r:])
        #print(que,"k")    

    print("NO")
#%%submit!
resolve()

Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
import random
def resolve():
    
    S=input()
    A="dream dreamer erase eraser".split()
    #print(A)
    que=[S]
    while(que!=[]):
        t=len(que)
        print(t)
        vS=que.pop(random.randint(0,t-1))
        if vS=="":
            print("YES")
            return
        for w in A:
            r=len(w)
            if vS[:r]==w:
                que.append(vS[r:])
        print(que,"k")    

    print("NO")
#%%submit!
resolve()

Fixed submission:
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
import random
def resolve():
    
    S=input()
    A="dream dreamer erase eraser".split()
    #print(A)
    que=[S]
    while(que!=[]):
        t=len(que)
        #print(t)
        vS=que.pop(random.randint(0,t-1))
        if vS=="":
            print("YES")
            return
        for w in A:
            r=len(w)
            if vS[:r]==w:
                que.append(vS[r:])
        #print(que,"k")    

    print("NO")
#%%submit!
resolve()

Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
def resolve():
    S=input()
    n=len(S)
    A="dream dreamer erase eraser".split()
    #print(A)
    global cond
    cond=[]
    def dfslike_dreameraser(varS):#string->bool,resursion
        #print(varS)
        if len(varS)==0:
            cond.append(1)
            return 
        for word in A:
            if varS[:len(word)]==word:
                dfslike_dreameraser(varS[len(word):])
        return 
        
    dfslike_dreameraser(S)
    #print(cond)
    print(["NO","YES"][cond!=[]])
#%%submit!
resolve()

Fixed submission:
#!/usr/bin/env python3
#%% for atcoder uniittest use
import sys
input= lambda: sys.stdin.readline().rstrip()
sys.setrecursionlimit(10**9)
def pin(type=int):return map(type,input().split())
def tupin(t=int):return tuple(pin(t))
def lispin(t=int):return list(pin(t))
#%%code
import random
def resolve():
    
    S=input()
    A="dream dreamer erase eraser".split()
    #print(A)
    que=[S]
    while(que!=[]):
        t=len(que)
        #print(t)
        vS=que.pop(random.randint(0,t-1))
        if vS=="":
            print("YES")
            return
        for w in A:
            r=len(w)
            if vS[:r]==w:
                que.append(vS[r:])
        #print(que,"k")    

    print("NO")
#%%submit!
resolve()