qyliang/CodeNanoFix huggingface dataset:
Buggy code:
S = list(input())
N = len(S)

def f(x):
    print(x)
    exit()

if N < 5:
    f("NO")
elif S[0] == "d":
    w = 1
elif S[0] == "e":
    w = -1
else:
    f("NO")

i = 0
while True:
    if w > 0:
        if S[i]+S[i+1]+S[i+2]+S[i+3]+S[i+4] == "dream":
            i += 5
            if i == N:
                f("YES")
            elif S[i] == "d":
                pass
            elif S[i] == "e":
                if i+1 <= N-1:
                    if S[i+1] == "r":
                        if i+1 == N-1:
                            f("YES")
                        elif S[i+2] == "a":
                            w *= -1
                        elif S[i+2] == "e":
                            i += 2
                            w *= -1
                        elif S[i+2] == "d":
                            i += 2
                        else:
                            f("NO")
                    else:
                        f("NO")
                else:
                    f("NO")
            else:
                f("NO")
        else:
            f("NO")
    elif w < 0:
        if S[i]+S[i+1]+S[i+2]+S[i+3]+S[i+4] == "erase":
            i += 5
            if i == N:
            if S[i] == "r":
                i += 1
                if i == N:
            if S[i] == "d":
                w *= -1
            elif S[i] == "e":
                pass
            else:
                f("NO")
        else:
            f("NO")
    if i+4 > N-1:
        f("NO")


Fixed code:
S = list(input())
N = len(S)

def f(x):
    print(x)
    exit()

if N < 5:
    f("NO")
elif S[0] == "d":
    w = 1
elif S[0] == "e":
    w = -1
else:
    f("NO")

i = 0
while True:
    if w > 0:
        if S[i]+S[i+1]+S[i+2]+S[i+3]+S[i+4] == "dream":
            i += 5
            if i == N:
                f("YES")
            elif S[i] == "d":
                pass
            elif S[i] == "e":
                if i+1 <= N-1:
                    if S[i+1] == "r":
                        if i+1 == N-1:
                            f("YES")
                        elif S[i+2] == "a":
                            w *= -1
                        elif S[i+2] == "e":
                            i += 2
                            w *= -1
                        elif S[i+2] == "d":
                            i += 2
                        else:
                            f("NO")
                    else:
                        f("NO")
                else:
                    f("NO")
            else:
                f("NO")
        else:
            f("NO")
    elif w < 0:
        if S[i]+S[i+1]+S[i+2]+S[i+3]+S[i+4] == "erase":
            i += 5
            if i == N:
                f("YES")
            if S[i] == "r":
                i += 1
                if i == N:
                    f("YES")
            if S[i] == "d":
                w *= -1
            elif S[i] == "e":
                pass
            else:
                f("NO")
        else:
            f("NO")
    if i+4 > N-1:
        f("NO")
Buggy code:
# coding: utf-8
"""this is python work script"""

def solver(word):
    """solve this problem"""
    check_result = word.replace('dreamer', '').replace('dream', '').replace('eraser', '').replace('erase', '')

    answer = 'YES'
    if check_result:
        answer = 'NO'

    return answer

def main():
    """main function"""
    input_word = input().rstrip()
    answer = solver(input_word)
    print(answer)

if __name__ == '__main__':
    main()


Fixed code:
# coding: utf-8
"""this is python work script"""

def solver(word):
    """solve this problem"""
    check_result = word.replace('eraser', '').replace('erase', '').replace('dreamer', '').replace('dream', '')

    answer = 'YES'
    if check_result:
        answer = 'NO'

    return answer

def main():
    """main function"""
    input_word = input().rstrip()
    answer = solver(input_word)
    print(answer)

if __name__ == '__main__':
    main()
Buggy code:
s = input()
s = s[::-1]
ans = ["maerd","remaerd","esare","resare"]
flag = 1
while len(s) != 0 and flag == 1:
    flag = 0
    if s[:5] in ans:
        s = s[5:]
        flag = 1
    elif s[:7] in ans:
        s = s[7:]
        flag = 1
        
if flag == 0:
    print("NO")
else:
    print("YES")

Fixed code:
s = input()
s = s[::-1]
ans = ["maerd","remaerd","esare","resare"]
flag = 1
while len(s) != 0 and flag == 1:
    flag = 0
    if s[:5] in ans:
        s = s[5:]
        flag = 1
    elif s[:7] in ans:
        s = s[7:]
        flag = 1
    elif s[:6] in ans:
        s = s[6:]
        flag = 1
        
if flag == 0:
    print("NO")
else:
    print("YES")
Buggy code:
def test():
    s = input()
    divide = ["dream", "dreamer", "erase", "eraser"]
    dp = [0 for i in range(10010)]

    dp[0] = 1
    for i in range(len(dp)):
        if dp[len(s)] == 1:
            print('YES')
            return 0
        if dp[i] == 0:
            continue
        for d in divide:
            if s[i:i+len(d)] == d:
                dp[i+len(d)] = 1
                print(i+len(d))
    print('NO')

test()

Fixed code:
def test():
    s = input()
    divide = ["dream", "dreamer", "erase", "eraser"]
    dp = [0 for i in range(100010)]

    dp[0] = 1
    for i in range(len(dp)):
        if dp[len(s)] == 1:
            print('YES')
            return 0
        if dp[i] == 0:
            continue
        for d in divide:
            if s[i:i+len(d)] == d:
                dp[i+len(d)] = 1
    print('NO')

test()
Buggy code:
S=input()
T=[]

l=-1
while l-2>=-len(S):
    k=S[l:l-3:-1]
    print(k)
    if k=="mae":
        T+="dream"[::-1]
        l-=5
    elif k=="rem":
        T+="dreamer"[::-1]
        l-=7
    elif k=="esa":
        T+="erase"[::-1]
        l-=5
    elif k=="res":
        T+="eraser"[::-1]
        l-=6
    else:
        break
if S=="".join(T[::-1]):
    print("YES")
else:
    print("NO")


Fixed code:
S=input()
T=[]

l=-1
while l-2>=-len(S):
    k=S[l:l-3:-1]
    if k=="mae":
        T+="dream"[::-1]
        l-=5
    elif k=="rem":
        T+="dreamer"[::-1]
        l-=7
    elif k=="esa":
        T+="erase"[::-1]
        l-=5
    elif k=="res":
        T+="eraser"[::-1]
        l-=6
    else:
        break
if S=="".join(T[::-1]):
    print("YES")
else:
    print("NO")
Buggy code:
import sys
sys.setrecursionlimit(1000000)

S_list = list(input())

def f(S_list):
  if S_list == []:
    print("Yes")
    exit()
  elif "".join(S_list[0:11]) == "dreameraser":
    del S_list[0:11]
#    print(S_list)
    f(S_list)
  elif "".join(S_list[0:10]) == "dreamerase":
    del S_list[0:10]
#    print(S_list)
    f(S_list)
  elif "".join(S_list[0:7]) == "dreamer":
    del S_list[0:7]
#    print(S_list)
    f(S_list)
  elif "".join(S_list[0:6]) == "eraser":
    del S_list[0:6]
#    print(S_list)
    f(S_list)
  elif "".join(S_list[0:5]) == "dream" or "".join(S_list[0:5]) == "erase":
    del S_list[0:5]
#    print(S_list)
    f(S_list)
  else:
    print("No")
    exit()

f(S_list)

Fixed code:
import sys
sys.setrecursionlimit(1000000)

S_list = list(input())

def f(S_list):
  if S_list == []:
    print("YES")
    exit()
  elif "".join(S_list[0:11]) == "dreameraser":
    del S_list[0:11]
#    print(S_list)
    f(S_list)
  elif "".join(S_list[0:10]) == "dreamerase":
    del S_list[0:10]
#    print(S_list)
    f(S_list)
  elif "".join(S_list[0:7]) == "dreamer":
    del S_list[0:7]
#    print(S_list)
    f(S_list)
  elif "".join(S_list[0:6]) == "eraser":
    del S_list[0:6]
#    print(S_list)
    f(S_list)
  elif "".join(S_list[0:5]) == "dream" or "".join(S_list[0:5]) == "erase":
    del S_list[0:5]
#    print(S_list)
    f(S_list)
  else:
    print("NO")
    exit()

f(S_list)
Buggy code:
s = input()

s = s.replace("dreamer", "")
s = s.replace("dream", "")
s = s.replace("eraser", "")
s = s.replace("erase", "")

if len(s) > 0:
    print("NO")
else:
    print("YES")

Fixed code:
s = input().replace("eraser","").replace("erase","").replace("dreamer","").replace("dream","")
if len(s)!=0:
    print("NO")
else:
    print("YES")
Buggy code:
s = input()

s = s.replace("dreamer", "").strip()
s = s.replace("dream", "").strip()
s = s.replace("eraser", "").strip()
s = s.replace("erase", "").strip()

if len(s) > 0:
    print("NO")
else:
    print("YES")

Fixed code:
s = input()

s = s.replace("eraser", "")
s = s.replace("erase", "")
s = s.replace("dreamer", "")
s = s.replace("dream", "")


if len(s) > 0:
    print("NO")
else:
    print("YES")
Buggy code:
s=input().replace("eraser","")
s=s.replace("erase","")
s=s.replace("dreamer","")
s=s.replace("dream","")
if s:
	print("No")
else:
	print("Yes")
"""
#failed
import itertools

s=str(input())
add=["dream","dreamer","erase","eraser"]
t=[]

for i,_ in enumerate(add,1):
	for j in itertools.permutations(add,r=i):
		t.append("".join(j))

print(t)

temp=False
for i in range(len(t)):
	if(s==t[i]):
		temp=True
		break

if temp==True:
	print("Yes")
else:
	print("No")
	

"""

Fixed code:
s = input().replace("eraser","").replace("erase","").replace("dreamer","").replace("dream","")
if s:
    print("NO")
else:
    print("YES")

"""
#failed
import itertools

s=str(input())
add=["dream","dreamer","erase","eraser"]
t=[]

for i,_ in enumerate(add,1):
	for j in itertools.permutations(add,r=i):
		t.append("".join(j))

print(t)

temp=False
for i in range(len(t)):
	if(s==t[i]):
		temp=True
		break

if temp==True:
	print("Yes")
else:
	print("No")
	

"""
Buggy code:
S=input()
while len(S) >=5:
	if S[-7:]=='dreamer':
		S=S[:-7]
	elif S[-6:] == 'eraser':
		S=S[:-6]
	elif S[-5:] == 'dream':
		S=S[:-5]
	elif S[-5:] == 'erase':
		S=S[:-5]
	else:
		print('No')
		break
if len(S)==0:
	print('YES')
if 1<=len(S)<=4:
	print('NO')

Fixed code:
S=input()
while len(S) >=5:
	if S[-7:]=='dreamer':
		S=S[:-7]
	elif S[-6:] == 'eraser':
		S=S[:-6]
	elif S[-5:] == 'dream':
		S=S[:-5]
	elif S[-5:] == 'erase':
		S=S[:-5]
	else:
		print('NO')
		break
if len(S)==0:
	print('YES')
if 1<=len(S)<=4:
	print('NO')
Buggy code:
s = input()
s.replace('eraser', '').replace('erase', '').replace('dreamer', '').replace('dream', '')
if s == '':
    print('YES')
else:
    print('NO')

Fixed code:
s = input().replace("eraser","").replace("erase","").replace('dreamer','').replace('dream','')
if s:
    print('NO')
else:
    print('YES')
Buggy code:
#  S = input()[::-1]
#  S = "erasedream"[::-1]
S = "dreameraser"[::-1]
s1 = "dream"[::-1]
s2 = "dreamer"[::-1]
s3 = "erase"[::-1]
s4 = "eraser"[::-1]
index = 0
ret = False
while True:
    if S[index : index + len(s2) :] == s2:
        index += len(s2)
    elif S[index : index + len(s4) :] == s4:
        index += len(s4)
    elif S[index : index + len(s1) :] == s1 or S[index : index + len(s3) :] == s3:
        index += len(s1)
    else:
        break
    if index == len(S):
        ret = True
        break
print("YES" if ret else "NO")


Fixed code:
S = input()[::-1]
s1 = "dream"[::-1]
s2 = "dreamer"[::-1]
s3 = "erase"[::-1]
s4 = "eraser"[::-1]
index = 0
ret = False
while True:
    if S[index : index + len(s2) :] == s2:
        index += len(s2)
    elif S[index : index + len(s4) :] == s4:
        index += len(s4)
    elif S[index : index + len(s1) :] == s1 or S[index : index + len(s3) :] == s3:
        index += len(s1)
    else:
        break
    if index == len(S):
        ret = True
        break
print("YES" if ret else "NO")
Buggy code:
S = list(input())
re = ['dream','dreamer','erase','eraser']
devide = False

T = []

for l in range(len(S)):
    T.insert(0,S.pop(-1))
    if len(T) >= 5:
        if ''.join(T) in re:
            T = []
    if len(T) > 7:
        break
    if T == [] and S == []:
        devide = True

if devide == False:
    print('No')
else:
    print('YES')




Fixed code:
S = list(input())
re = ['dream','dreamer','erase','eraser']
devide = False

T = []

for l in range(len(S)):
    T.insert(0,S.pop(-1))
    if len(T) >= 5:
        if ''.join(T) in re:
            T = []
    if len(T) > 7:
        break

if T == []:
    devide = True

if devide == False:
    print('NO')
else:
    print('YES')
Buggy code:
S = input()


S = S.replace('eraser', '').replace('erase', '').replace('dreamer', '').replace('dream', '')

if S is '':
    print('YES')
else:
    print('NO')
print(S)

Fixed code:
S = input()


S = S.replace('eraser', '').replace('erase', '').replace('dreamer', '').replace('dream', '')

if S is '':
    print('YES')
else:
    print('NO')
Buggy code:
s = input()[::-1]
words = [w[::-1] for w in ['dream', 'dreamer', 'erase', 'eraser']]

can = 'YES'
while s:
    print(s)
    match_any = False
    for w in words:
        if s.startswith(w):
            s = s.replace(w, '', 1)
            match_any = True
            break
    if not match_any:
        can = 'NO'
        break
print(can)


Fixed code:
s = input()[::-1]
words = [w[::-1] for w in ['dream', 'dreamer', 'erase', 'eraser']]

can = 'YES'
while s:
    match_any = False
    for w in words:
        if s.startswith(w):
            s = s.replace(w, '', 1)
            match_any = True
            break
    if not match_any:
        can = 'NO'
        break
print(can)
Buggy code:
s = input()
s = s.replace('dreamer','').replace('dream','').replace('eraser','').replace('erase','')
print('YES' if s == '' else 'NO')


Fixed code:
s = input().replace('eraser', '').replace(
    'erase', '').replace('dreamer', '').replace('dream', '')
print('YES' if s == "" else "NO")
Buggy code:
S = input()
S = list(S)
print(S)
S.reverse()
print(S)
T = []
n = len(S)
for i in range(n):
  T.append(S[i])
  mojiretu = ''.join(T)
  m = len(mojiretu)
  if mojiretu == "maerd" or mojiretu == "remaerd" or mojiretu == "esare" or mojiretu == "resare":
    T =[]
  elif m==8:
      break
N = len(T)
if N == 0:
  print("YES")
else:
  print("NO")


Fixed code:
S = input()
S = list(S)
S.reverse()
T = []
n = len(S)
for i in range(n):
  T.append(S[i])
  mojiretu = ''.join(T)
  m = len(mojiretu)
  if mojiretu == "maerd" or mojiretu == "remaerd" or mojiretu == "esare" or mojiretu == "resare":
    T =[]
  elif m==8:
      break
N = len(T)
if N == 0:
  print("YES")
else:
  print("NO")
Buggy code:
S = str(input())S = str(input())
while "eraser" in S:     
    S=S.replace("eraser","")
while "erase" in S: 
    S=S.replace("erase","")
while "dreamer" in S: 
    S=S.replace("dreamer","")
while "dream" in S: 
    S=S.replace("dream","")
if len(S) == 0:
    print("YES")
else:
    print("NO")

Fixed code:
S = str(input())
while "eraser" in S:     
    S=S.replace("eraser","")
while "erase" in S: 
    S=S.replace("erase","")
while "dreamer" in S: 
    S=S.replace("dreamer","")
while "dream" in S: 
    S=S.replace("dream","")
if len(S) == 0:
    print("YES")
else:
    print("NO")
Buggy code:
s = input()
l = (len(s))
t = ''
u = ['dream', 'dreamer', 'erase', 'eraser'] 

while s != '':
    if s[-1]  == 'r':
        now = s[-7:]
        #print(now)
        if now == 'dreamer':
            s = s[:len(s)-7]
        elif now[-6] == 'eraser':
            s = s[:len(s)-6]
        else:
            print('NO')
            exit()
    else:
        now = s[-5:]
        #print(now)
        if now in u:
            s = s[:len(s)-5]
        else:
            print('NO')
            exit()

print('YES')


Fixed code:
s = input()
l = (len(s))
t = ''
u = ['dream', 'dreamer', 'erase', 'eraser'] 

while s != '':
    if s[-1]  == 'r':
        now = s[-7:]
        #print(now)
        if now == 'dreamer':
            #print(now)
            s = s[:len(s)-7]
        elif now[-6:] == 'eraser':
            #print(now)
            s = s[:len(s)-6]
        else:
            print('NO')
            exit()
    else:
        now = s[-5:]
        #print(now)
        if now in u:
            #print(now)
            s = s[:len(s)-5]
        else:
            print('NO')
            exit()

print('YES')
Buggy code:
string = input()
erase = 'erase'
eraser = 'eraser'
dream = 'dream'
dreamer = 'dreamer'
er = 'er'
a = 'a'
r = 'r'
while True:
    if string[:5] == dream:
        if string[5:7] == er:
            if string[7:8] == a:
                string = string[5:]
            else:
                string = string[7:]
        else:
            string = string[5:]
    elif string[:5] == erase:
        if string[5:6]== r:
            if string[6:7] == a:
                string = string[5:]
            else:
                string = string[6:]
        else:
                string = string[5:]
    elif string == []:
        print('YES')
        break
    else:
        print('NO')
        break

Fixed code:
string = input()
erase = 'erase'
eraser = 'eraser'
dream = 'dream'
dreamer = 'dreamer'
er = 'er'
a = 'a'
r = 'r'
while True:
    if string[:5] == dream:
        if string[5:7] == er:
            if string[7:8] == a:
                string = string[5:]
            else:
                string = string[7:]
        else:
            string = string[5:]
    elif string[:5] == erase:
        if string[5:6] == r:
            if string[6:7] == a:
                string = string[5:]
            else:
                string = string[6:]
        else:
            string = string[5:]
    elif string == '':
        print('YES')
        break
    else:
        print('NO')
        break
Buggy code:
s = input()

while 1:
    for x in ('dream', 'dreamer', 'erase', 'eraser'):
        if s.endswith(x):
            s = s[:-len(x)]
            break
    else:
        print('NO')
        break
    if not s:
        print('YES')

Fixed code:
s = input()

while 1:
    for x in ('dream', 'dreamer', 'erase', 'eraser'):
        if s.endswith(x):
            s = s[:-len(x)]
            break
    else:
        print('NO')
        break
    if not s:
        print('YES')
        break
Buggy code:
S = input()
while True:
    if S[-5:] == 'dream':
        S = S[:-5]
        continue
    elif S[-7:] == 'dreamer':
        S = S[:-7]
        continue
    elif S[-5:] == 'erase':
        S = S[:-5]
        continue
    elif S[-6:] == 'eraser':
        S = S[:-6]
    break

print('YES' if not S else 'NO')

Fixed code:
S = input()
while True:
    if S[-5:] == 'dream':
        S = S[:-5]
        continue
    elif S[-7:] == 'dreamer':
        S = S[:-7]
        continue
    elif S[-5:] == 'erase':
        S = S[:-5]
        continue
    elif S[-6:] == 'eraser':
        S = S[:-6]
        continue
    break

print('YES' if not S else 'NO')
Buggy code:
T = input()
S = ''
p,q,r,s = 'maerd','esare','remaerd','resare'
for i in range(len(T)):
    S += T[len(T)-i]
while len(S) >= 7:
    x = S[:5]
    y = S[:6]
    z = S[:7]
    if x == p or x == q:
        if len(S) > 5:
            S = S[5:]
        else:
            S = ''
    elif y == s:
        if len(S) > 6:
            S = S[6:]
        else:
            S = ''
    elif z == r:
        if len(S) > 7:
            S = S[7:]
        else:
            S = ''
    else:
        break
ans = 'NO'
if len(S) == 0:
    ans = 'YES'

Fixed code:
T = input()
S = ''
p,q,r,s = 'maerd','esare','remaerd','resare'
for i in range(len(T)):
    S += T[len(T)-i-1]
while len(S) >= 5:
    x = S[:5]
    y = S[:6]
    z = S[:7]
    if x == p or x == q:
        if len(S) > 5:
            S = S[5:]
        else:
            S = ''
    elif y == s:
        if len(S) > 6:
            S = S[6:]
        else:
            S = ''
    elif z == r:
        if len(S) > 7:
            S = S[7:]
        else:
            S = ''
    else:
        break
ans = 'NO'
if len(S) == 0:
    ans = 'YES'
print(ans)
Buggy code:
s=input()
i=len(s)-1
ans=True
while 3<=i:
    print(i)
    if s[i-7:i]=='dreamer':
        i-=7
    elif s[i-5:i]=='dream':
        i-=5
    elif s[i-6:i]=='eraser':
        i-=6
    elif s[i-5:i]=='erase':
        i-=5
    else:
        ans=False
        break
if ans:
    print('YES')
else:
    print('NO')

Fixed code:
s=input()
i=len(s)
ans=True
while 3<=i:
    if s[i-7:i]=='dreamer':
        i-=7
    elif s[i-5:i]=='dream':
        i-=5
    elif s[i-6:i]=='eraser':
        i-=6
    elif s[i-5:i]=='erase':
        i-=5
    else:
        ans=False
        break
if ans:
    print('YES')
else:
    print('NO')
Buggy code:
n = list(input())
n = n[::-1]
a = "dream"
a = a[::-1]
b = "dreamer"
b = b[::-1]
c = "eraser"
c = c[::-1]
d = "erase"
d = d[::-1]
co = 0
su = 0
for i in range(len(n)):
    co += 1
    if co == 5:
        if n[i:i+co] == "dream" or n[i:i+co] == "erase":
            su += 5
            co = 0
    elif co == 6:
        if n[i:i+co] == "eraser":
            su += 6
            co = 0
    elif co == 7:
        if n[i:i+co] == "dreamer":
            su += 7
            co = 0
    elif co >= 8:
        break
if su == len(n):
    print("YES")
else:
    print("NO")


Fixed code:
n = input()
n = n[::-1]
a = "dream"
a = a[::-1]
b = "dreamer"
b = b[::-1]
c = "eraser"
c = c[::-1]
d = "erase"
d = d[::-1]
co = 0
su = 0

for i in range(len(n)):
    co += 1
    if co == 5:
        if n[su:su+co] == a or n[su:su+co] == d:
            su += 5
            co = 0
    elif co == 6:
        if n[su:su+co] == c:
            su += 6
            co = 0
    elif co == 7:
        if n[su:su+co] == b:
            su += 7
            co = 0
    elif co >= 8:
        break
if su == len(n):
    print("YES")
else:
    print("NO")
Buggy code:
s = input()
# curs = [index1, index2] 
curs = [0]
while True:
  next_curs = []
  break_ = False
  for c in curs:
    #print(c)
    if s[c:c+5] == 'dream':
      next_curs.append( c+5 )
      if len(s) == c+5:
        break_ = True
    if s[c:c+7] == 'dreamer':
      next_curs.append( c+7 )
      if len(s) == c+7:
        break_ = True
    if s[c:c+5] == 'erase':
      next_curs.append( c+5 )
      if len(s) == c+5:
        break_ = True
    if s[c:c+6] == 'eraser':
      next_curs.append( c+6 )
      if len(s) == c+6:
        break_ = True
  if next_curs == []:
    print('No')
    break
  if break_: 
    print('Yes')
    break
  curs = next_curs

Fixed code:
s = input()
# curs = [index1, index2] 
curs = [0]
while True:
  next_curs = []
  break_ = False
  for c in curs:
    #print(c)
    if s[c:c+5] == 'dream':
      next_curs.append( c+5 )
      if len(s) == c+5:
        break_ = True
    if s[c:c+7] == 'dreamer':
      next_curs.append( c+7 )
      if len(s) == c+7:
        break_ = True
    if s[c:c+5] == 'erase':
      next_curs.append( c+5 )
      if len(s) == c+5:
        break_ = True
    if s[c:c+6] == 'eraser':
      next_curs.append( c+6 )
      if len(s) == c+6:
        break_ = True
  if next_curs == []:
    print('NO')
    break
  if break_: 
    print('YES')
    break
  curs = next_curs
Buggy code:
s=input()
for p in["eraser","erase","dreamer","dream"]:s.replace(p,"")
print("YES"if s else"NO")

Fixed code:
s=input()
for p in["eraser","erase","dreamer","dream"]:s=s.replace(p,"")
print("NO"if s else"YES")
Buggy code:
s = input()
if s.find("1") != -1:
    print("NO")
elif s.find("2") != -1:
    print("NO")
else:
    a = s.replace("dream", "11111").replace("erase", "22222").replace("11111er", "1111111").replace("22222r", "111111")
    print(a)
    if a.count("1") == len(a):
        print("YES")
    else:
        print("NO")


Fixed code:
s = input()
if s.find("1") != -1:
    print("NO")
elif s.find("2") != -1:
    print("NO")
else:
    a = s.replace("dream", "11111").replace("erase", "22222").replace("11111er", "1111111").replace("22222r", "111111").replace("22222", "11111")
    if a.count("1") == len(a):
        print("YES")
    else:
        print("NO")
Buggy code:
s=input()
s=s.replace("dreamer","")
s=s.replace("eraser","")
s=s.replace("dream","")
s=s.replace("erase","")
# print(s)
if s=="":
    print("YES")
else :
    print("NO")

Fixed code:
s = input().replace("eraser", "").replace("erase", "").replace("dreamer", "").replace("dream", "")
if s == "":
    print("YES")
else:
    print("NO")
Buggy code:
text = input().replace("dreamer", "").replace("dreame", "").replace("eraser", "").replace("erase", "")
if text:  # this is wrong: text == ""
    print("YES")
else:
    print("NO")

Fixed code:
text = input().replace("eraser", "").replace("erase", "").replace("dreamer", "").replace("dream", "")
if text:  # this is wrong: text == ""
    print("NO")
else:
    print("YES")