Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

S = input()

cands = ["dream", "dreamer", "erase", "eraser"]
searched = {}

queue = deque([""])
find_flag = 0
last_s = ""
while len(queue) != 0:
    s = queue.popleft()
    searched[s] = 1
    if s == S:
        find_flag = 1
        break
        
    s_ = cands[0]
    if (s_ == S[len(s):len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)

    s_ = cands[1]
    if (s_ == S[len(s):len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
    s_ = cands[2]
    if (s_ == S[len(s):len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
    s_ = cands[3]
    if (s_ == S[len(s):len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
#     # 追加できる候補が無くなったら抜ける
#     break

if find_flag:
    print("YES")
else:
    print("NO")

Fixed submission:
S = input()

candidates = ["dream", "dreamer", "erase", "eraser"]

find_flag = 0
rest_S = S
while True:
#     print(rest_S[-5:], rest_S[-7:]) 
    if len(rest_S) == 0:
        find_flag = 1
        break
    elif (len(rest_S) >= 7) & (rest_S[-7:] in candidates):
        rest_S = rest_S[:-7]
    elif (len(rest_S) >= 6) & (rest_S[-6:] in candidates):
        rest_S = rest_S[:-6]
    elif (len(rest_S) >= 5) & (rest_S[-5:] in candidates):
        rest_S = rest_S[:-5]
    else:
        break

if find_flag:
    print("YES")
else:
    print("NO")

Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

S = input()

cands = ["dream", "dreamer", "erase", "eraser"]
searched = {}

queue = deque([""])
find_flag = 0
while len(queue) != 0:
    s = queue.popleft()
#     print(s)
    searched[s] = 1
    if s == S:
        find_flag = 1
        break
        
    s_ = cands[0]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)

    s_ = cands[1]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
    s_ = cands[2]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
    s_ = cands[3]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)

if find_flag:
    print("YES")
else:
    print("NO")

Fixed submission:
S = input()

candidates = ["dream", "dreamer", "erase", "eraser"]

find_flag = 0
rest_S = S
while True:
#     print(rest_S[-5:], rest_S[-7:]) 
    if len(rest_S) == 0:
        find_flag = 1
        break
    elif (len(rest_S) >= 7) & (rest_S[-7:] in candidates):
        rest_S = rest_S[:-7]
    elif (len(rest_S) >= 6) & (rest_S[-6:] in candidates):
        rest_S = rest_S[:-6]
    elif (len(rest_S) >= 5) & (rest_S[-5:] in candidates):
        rest_S = rest_S[:-5]
    else:
        break

if find_flag:
    print("YES")
else:
    print("NO")

Buggy python submission (verdict: Time Limit Exceeded):
from collections import deque

S = input()

cands = ["dream", "dreamer", "erase", "eraser"]
searched = {}

queue = deque([""])
find_flag = 0
while len(queue) != 0:
    s = queue.pop()
#     print(s)
    searched[s] = 1
    if s == S:
        find_flag = 1
        break
        
    s_ = cands[0]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)

    s_ = cands[1]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
    s_ = cands[2]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
    s_ = cands[3]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)

if find_flag:
    print("YES")
else:
    print("NO")

Fixed submission:
S = input()

candidates = ["dream", "dreamer", "erase", "eraser"]

find_flag = 0
rest_S = S
while True:
#     print(rest_S[-5:], rest_S[-7:]) 
    if len(rest_S) == 0:
        find_flag = 1
        break
    elif (len(rest_S) >= 7) & (rest_S[-7:] in candidates):
        rest_S = rest_S[:-7]
    elif (len(rest_S) >= 6) & (rest_S[-6:] in candidates):
        rest_S = rest_S[:-6]
    elif (len(rest_S) >= 5) & (rest_S[-5:] in candidates):
        rest_S = rest_S[:-5]
    else:
        break

if find_flag:
    print("YES")
else:
    print("NO")

Buggy python submission (verdict: Time Limit Exceeded):
S = input()

cands = ["dream", "dreamer", "erase", "eraser"]
searched = {}

queue = [""]
find_flag = 0
while len(queue) != 0:
    s = queue.pop(0)
    searched[s] = 1
    if s == S:
        find_flag = 1
        break
        
    s_ = cands[0]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)

    s_ = cands[1]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
    s_ = cands[2]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)
        
    s_ = cands[3]
    if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
        queue.append(s+s_)

if find_flag:
    print("YES")
else:
    print("NO")

Fixed submission:
S = input()

candidates = ["dream", "dreamer", "erase", "eraser"]

find_flag = 0
rest_S = S
while True:
#     print(rest_S[-5:], rest_S[-7:]) 
    if len(rest_S) == 0:
        find_flag = 1
        break
    elif (len(rest_S) >= 7) & (rest_S[-7:] in candidates):
        rest_S = rest_S[:-7]
    elif (len(rest_S) >= 6) & (rest_S[-6:] in candidates):
        rest_S = rest_S[:-6]
    elif (len(rest_S) >= 5) & (rest_S[-5:] in candidates):
        rest_S = rest_S[:-5]
    else:
        break

if find_flag:
    print("YES")
else:
    print("NO")

Buggy python submission (verdict: Time Limit Exceeded):
S = input()

cands = ["dream", "dreamer", "erase", "eraser"]
searched = {}

queue = [""]
find_flag = 0
while len(queue) != 0:
    s = queue.pop(0)
    if s == S:
        find_flag = 1
        break
        
    for s_ in cands:
        if searched.get(s+s_):
            continue
        if (s+s_ == S[:len(s)+len(s_)]):
            searched[s+s_] = 1
            queue.append(s+s_)

if find_flag:
    print("YES")
else:
    print("NO")

Fixed submission:
S = input()

candidates = ["dream", "dreamer", "erase", "eraser"]

find_flag = 0
rest_S = S
while True:
#     print(rest_S[-5:], rest_S[-7:]) 
    if len(rest_S) == 0:
        find_flag = 1
        break
    elif (len(rest_S) >= 7) & (rest_S[-7:] in candidates):
        rest_S = rest_S[:-7]
    elif (len(rest_S) >= 6) & (rest_S[-6:] in candidates):
        rest_S = rest_S[:-6]
    elif (len(rest_S) >= 5) & (rest_S[-5:] in candidates):
        rest_S = rest_S[:-5]
    else:
        break

if find_flag:
    print("YES")
else:
    print("NO")

Buggy python submission (verdict: Time Limit Exceeded):
S = input()

cands = ["dream", "dreamer", "erase", "eraser"]
searched = {}

queue = [""]
find_flag = 0
while len(queue) != 0:
    s = queue.pop(0)
    if s == S:
        find_flag = 1
        break
        
    for s_ in cands:
        if (s+s_ == S[:len(s)+len(s_)]) & (not searched.get(s+s_)):
            searched[s+s_] = 1
            queue.append(s+s_)

if find_flag:
    print("YES")
else:
    print("NO")

Fixed submission:
S = input()

candidates = ["dream", "dreamer", "erase", "eraser"]

find_flag = 0
rest_S = S
while True:
#     print(rest_S[-5:], rest_S[-7:]) 
    if len(rest_S) == 0:
        find_flag = 1
        break
    elif (len(rest_S) >= 7) & (rest_S[-7:] in candidates):
        rest_S = rest_S[:-7]
    elif (len(rest_S) >= 6) & (rest_S[-6:] in candidates):
        rest_S = rest_S[:-6]
    elif (len(rest_S) >= 5) & (rest_S[-5:] in candidates):
        rest_S = rest_S[:-5]
    else:
        break

if find_flag:
    print("YES")
else:
    print("NO")

Buggy python submission (verdict: Runtime Error):
S = input()

find_flag = 0
rest_S = S
while True:
    if len(rest_S) == 0:
        find_flag = 1
        break
    elif rest_S[-5:] in candidates:
        rest_S = rest_S[:-5]
    elif rest_S[-6:] in candidates:
        rest_S = rest_S[:-6]
    else:
        break

if find_flag:
    print("YES")
else:
    print("NO")

Fixed submission:
S = input()

candidates = ["dream", "dreamer", "erase", "eraser"]

find_flag = 0
rest_S = S
while True:
#     print(rest_S[-5:], rest_S[-7:]) 
    if len(rest_S) == 0:
        find_flag = 1
        break
    elif (len(rest_S) >= 7) & (rest_S[-7:] in candidates):
        rest_S = rest_S[:-7]
    elif (len(rest_S) >= 6) & (rest_S[-6:] in candidates):
        rest_S = rest_S[:-6]
    elif (len(rest_S) >= 5) & (rest_S[-5:] in candidates):
        rest_S = rest_S[:-5]
    else:
        break

if find_flag:
    print("YES")
else:
    print("NO")