qyliang/CodeNanoFix huggingface dataset:
Buggy code:
N = int(input())

A = (N*(N+1))/2
print(A)

Fixed code:
N = int(input())
print(int(N * (N + 1) / 2))
Buggy code:
a = int(input())
b = N*(N+1)/2
print(int(b))

Fixed code:
N = int(input())
a = N*(N+1)/2
print(int(a))
Buggy code:
x = int(input())
print(x*(x+1)/2)

Fixed code:
x = int(input())
print(int(x*(x+1)/2))
Buggy code:
n=int(input())
print((1+n)*n/2)

Fixed code:
n = int(input())

ans = n*(n+1)//2

print(ans)
Buggy code:
n = int(input())
N = n*(n+1)/2
print(N)

Fixed code:
N = int(input())

print(int(N*(N+1)/2))
Buggy code:
n= int(input())
print(int((n*(n+1))/2))
print(1+n)*n/2

Fixed code:
n=int(input());print(int(n*(1+n)/2))
Buggy code:
n = int(input())
print(n * (n + 1) / 2)


Fixed code:
n=int(input())

ans=(1+n)*n//2
print(ans)
Buggy code:
n = input()
print(n * (n + 1) / 2)

Fixed code:
n = int(input())
print(int((n + 1) * n / 2))
Buggy code:
N = int(input())
print((1/2)*N*(N+1))

Fixed code:
N = int(input())

x = N * (N + 1) // 2

print(x)
Buggy code:
n=int(input())
print((1+n)/2*n)

Fixed code:
n=int(input())
print((1+n)*(n//2) + (n%2)*((1+n)//2))
Buggy code:
ans=""
for i in list(input()):
    if ans and i=="B":ans=ans[:-1]
    else:ans=ans+i
print(ans)

Fixed code:
ans=""
for i in list(input()):
    if ans and i=="B":ans=ans[:-1]
    else:ans=ans+i if i!="B" else ans
print(ans)
Buggy code:
from itertools import groupby as gb
ans=""
for i,b in gb(input()):
  if i=="B":
    s=s[:-len(list(b))]
  else:s+=i*len(list(b))
print(ans)

Fixed code:
from itertools import groupby as gb
s=""
for i,b in gb(input()):
  if i=="B":
    s=s[:-len(list(b))]
  else:s+=i*len(list(b))
print(s)
Buggy code:
from collections import deque
s=deque(input())
A=deque()
for i in range(len(s)):
  a=s.popleft()
  if a=="B":
    A.pop()
  else:
    A.append(a)
print("".join(A))

Fixed code:
from collections import deque
s=deque(input())
A=deque()
for i in range(len(s)):
  a=s.popleft()
  if a=="B":
    if len(A)>0:
      A.pop()
  else:
    A.append(a)
print("".join(A))
Buggy code:
S = list(input())
ans = []

for i in range(len(S)):
    if S[i] == 'B':
        if i == 0:
            pass
        else:
            del ans[-1]
        
    else:
        ans.append(S[i])

for x in ans:
    print(x,end='')
print()



Fixed code:
S = list(input())
ans = []

for i in range(len(S)):
    if S[i] == 'B':
        if len(ans) == 0:
            pass
        else:
            del ans[-1]
        
    else:
        ans.append(S[i])

for x in ans:
    print(x,end='')
print()
Buggy code:
s = input()

result = ""
for i in s:
  if i == 'B':
    s = s[:-1]
  else
    s = s+i
print(s)

Fixed code:
s = input()
ans = ''
for i in s:
    if i=='B':
        ans = ans[:-1]
    else:
        ans += i
print(ans)
Buggy code:
s = input()
s = input()
ans =''
for i in range(len(s)):
  if i ==1:
    ans+='1'
  elif i==0:
    ans+='0'
  elif i=='B':
      ans = ans[:-1]
print(ans)

Fixed code:
s = input()
num = len(s)
ans = ""

for i in range(num):
  if s[i] != 'B':
    ans += s[i]
  elif len(ans) != 0:
    ans = ans[:-1]

    
print(ans)
Buggy code:
s = list(input())
str = ""

for i in range(len(s)):
  if s[i] == 'B':
    str = str[0:-2]
  else:
    str += s[i]

print(str)


Fixed code:
s = list(input())
str = ""

for i in range(len(s)):
  if s[i] == 'B':
    str = str[0:-1]
  else:
    str += s[i]

print(str)
Buggy code:
s = input()
ans = []
for i in range(len(s)):
    if s[i] == 'B' and ans:
        ans.pop()
    else:
        ans.append(s[i])
print(ans)

Fixed code:
s = input()
ans = []
for i in range(len(s)):
    if s[i] == 'B':
        if ans:
            ans.pop()
    else:
        ans.append(s[i])
print(''.join(ans))
Buggy code:
S=str(input())
ans=""
for i in range(len(S)):
    if S[i]=="B":
        ans=ans[:len(ans)-1]
    else:
        ans+=S[i]
    print(ans)
print(ans)

Fixed code:
S=str(input())
ans=""
for i in range(len(S)):
    if S[i]=="B":
        ans=ans[:len(ans)-1]
    else:
        ans+=S[i]
print(ans)
Buggy code:
s = input()
p = ''
for i in range(len(s)):
    if s[i] == 'B':
        if len(p) > 0:
            print(p[:-1])
            p = p[:-1]
    else:
        p += s[i]
print(p)

Fixed code:
s = input()

ans = ''
for i in range(len(s)):
    if s[i] == 'B':
        if len(ans) > 0:
            ans = ans[:-1]
    else:
        ans += s[i]
print(ans)
Buggy code:
S = input()
cha = list(S)
plist = []

for i in cha:
    if i == "B":
        del plist[-1]
    else:
        plist.append(i)

plist = "".join(plist)

print(plist)

Fixed code:
S = input()
cha = list(S)
plist = []

for i in cha: 
    if i == "B":
        if plist != []:
            del plist[-1]
    else:
        plist.append(i)
            
plist = "".join(plist)

print(plist)
Buggy code:
S = input()
ans = ""
for i in S:
  if i == "B":
    S = S[:-1]
  else:
    ans += i
print(ans)

Fixed code:
S = input()
ans = ""
for i in S:
  if i == "B":
    ans = ans[:-1]
  else:
    ans += i
print(ans)
Buggy code:
s = input()
res =[]
for i in range(len(s)):
	print(res)
	if s[i] == 'B':
		if len(res) != 0:
			res.pop(len(res)-1)
		continue
	res.append(s[i])

print("".join(res))

Fixed code:
s = input()
res =[]
for i in range(len(s)):
	if s[i] == 'B':
		if len(res) != 0:
			res.pop(len(res)-1)
		continue
	res.append(s[i])

print("".join(res))
Buggy code:
 a = input()

 ret = ""
 cnt = 0
 for i in a:
     if i == "B":
         ret = ret[:-1:]
     else:
         ret += i
 print(ret)


Fixed code:
a = input()

ret = ""
cnt = 0
for i in a:
    if i == "B":
        ret = ret[:-1:]
    else:
        ret += i
print(ret)
Buggy code:
s = input()

counter = 0
moji = ""
for i in s:
  if i == "B":
	moji[:-1]
    continue
  else:
    moji+ i

Fixed code:
s = input()
 
counter = 0
moji = ""
for i in s:
	
	if i == "B":
		moji = moji[:-1]
		
		continue
    	

	moji = moji+ i

print(moji)
Buggy code:
n =input()
ans=""

for i in range(len(n)):
    if n[i] == " ":
        if ans:
            ans = ans[:-1]
    else:
        ans +=n[i]

print(ans)


Fixed code:
n =input()
ans=""

for i in range(len(n)):
    if n[i] == "B":
        if ans:
            ans = ans[:-1]
    else:
        ans +=n[i]

print(ans)
Buggy code:
s=input()
n=len(s)
a=[]
b=""
for i in range(s):
  if s[i]=="B":
    a.pop()
  else:
    a.append(s[i])
for i in range(len(a)):
  b+=a[i]
print(b)
    

Fixed code:
s=input()
n=len(s)
a=[]
b=""
for i in range(n):
  if s[i]=="B":
    if len(a)!=0:
      a.pop()
  else:
    a.append(s[i])
for i in range(len(a)):
  b+=a[i]
print(b)
Buggy code:
s=list(input())
res=[]
for i in s:
    if i=="b":
        res=res[:-1]
    else:
        res.append(i)
print("".join(res))

Fixed code:
s=list(input())
res=[]
for i in s:
    if i=="B":
        res=res[:-1]
    else:
        res.append(i)
print("".join(res))
Buggy code:
t=""
for i in input():
    if i=="B":
        t=t[:-1]
    else:
        t+=i
    print(t) 
        
    


Fixed code:
t=""
for i in input():
    if i=="B":
        t=t[:-1]
    else:
        t+=i
print(t)
Buggy code:
s = str(input())
n = len(s)
a = []
for i in range(n):
    if s[i] != 'B':
        a.append(s[i])
    else:
        if len(s) != 0:
            a.pop(-1)
t =''
m = len(a)
for j in range(m):
    t += a[j]
print(t)

Fixed code:
s = str(input())
n = len(s)
a = []
for i in range(n):
    if s[i] != 'B':
        a.append(s[i])
    else:
        if len(a) != 0:
            a.pop(-1)
t =''
m = len(a)
for j in range(m):
    t += a[j]
print(t)
Buggy code:
c=list(input())
s=""
for x in c:
    if x!=B:
        s+=x
    else:
        s=s[:-1]
print(s)

Fixed code:
c=list(input())
s=""
for x in c:
    if x!="B":
        s+=x
    else:
        s=s[:-1]
print(s)
Buggy code:
s=list(input())
out=[]
for i in range(len(s)):
    if s[i]=="B" and out==[]:
        out=[]
    elif s[i]=="B":
        del(out[-1])
    else:
        out.append(s[i])
for i in range(len(out)):
    print(out[i])

Fixed code:
s=list(input())
out=[]
for i in range(len(s)):
    if s[i]=="B" and out==[]:
        out=[]
    elif s[i]=="B":
        del(out[-1])
    else:
        out.append(s[i])
for i in range(len(out)):
    print(out[i],end="")
Buggy code:
s = list(input())
answer = []

for i range s:
        if  i == "B":
            try:
                answer.pop()
            except:
                pass
        else:
            answer.append(i)

print("".join(answer))

Fixed code:
s = list(input())
answer = []

for i in s:
        if  i == "B":
            try:
                answer.pop()
            except:
                pass
        else:
            answer.append(i)

print("".join(answer))
Buggy code:
s = list(input())
answer = []

for i range s:
        if  i == "B":
            try:
                answer.pop()
            except IndexError:
                pass
        else:
            answer.append(i)

print(" ".join(answer))

Fixed code:
s = list(input())
answer = []

for i in s:
        if  i == "B":
            try:
                answer.pop()
            except IndexError:
                pass
        else:
            answer.append(i)

print("".join(answer))
Buggy code:
s = input()
ans = []
for i in s:
  if i == "B":
    if ans:
      ans.pop()
  else:
    ans.append(i)
print(*ans)

Fixed code:
s = input()
ans = []
for i in s:
  if i == "B":
    if ans:
      ans.pop()
  else:
    ans.append(i)
print("".join(ans))
Buggy code:
s = input()
x = []
for c in s:
  if c == 'B':
    x.pop()
  else:
    x.append(c)
answer = ''.join(x)
print(answer)

Fixed code:
s = input()
x = []

for c in s:
  if c == 'B':
    if x:
      x.pop()
  else:
    x.append(c)
    
answer = ''.join(x)
print(answer)
Buggy code:
S = input()

disp = []
for s in S:
    if s == "B":
        if len(s) > 0:
            disp.pop()
        continue
    disp.append(s)
print("".join(disp))

Fixed code:
S = input()

disp = []
for s in S:
    if s == "B":
        if len(disp) > 0:
            disp.pop()
        continue
    disp.append(s)
print("".join(disp))
Buggy code:
a = ""
for i in input():
  if(i == "B" and a != ""):
    a = a[:len(a)-1]
  else:
    a += i
print(a)

Fixed code:
a = ""
for i in input():
  if(i == "B"):
    if(a != ""):
	    a = a[:len(a)-1]
  else:
    a += i
print(a)
Buggy code:
s = input()
ans = []
for i in s:
    if i != "B":
        ans.append(i)
        continue
    if len(i) == 0:
        continue
    elif len(i) != 0:
        ans.pop()
print(*ans, sep="")


Fixed code:
s = input()
ans = []
for i in s:
    if i != "B":
        ans.append(i)
        continue
    if len(ans) == 0:
        continue
    elif len(ans) != 0:
        ans.pop()
print(*ans, sep="")
Buggy code:
S=input()

result=[]

for s in S:
  print(result)
  #if s=="B":
    if len(result)>0:
      #print("nBack")
      result.pop()
  else:
    result.append(s)

print(*result)

Fixed code:
S=input()

result=[]

for s in S:
  #print(result)
  if s=="B":
    if len(result)>0:
      #print("nBack")
      result.pop()
  else:
    result.append(s)

print(*result,sep="")
Buggy code:
S = list(input())
Answer = []

for s in S:
    if s == 'B' and Answer != []:
        del Answer[-1]
    else:
        Answer.append(s)

print(*Answer, sep="")


Fixed code:
S = list(input())
Answer = []

for s in S:
    if s == 'B' and Answer != []:
        del Answer[-1]
    elif s == 'B' and Answer == []:
        continue
    else:
        Answer.append(s)

print(*Answer, sep="")
Buggy code:
s = input()
t = []
for x in s:
  if x =="B":
    try:t.pop()
    except:pass
  else:
    t.append(x)
print("".joint(t))
  

Fixed code:
s = input()
t = []
for x in s:
  if x =="B":
    try:t.pop()
    except:pass
  else:
    t.append(x)
print("".join(t))
Buggy code:
s = input()
ans = ''
for x in s :
     if x == 'B' :
          ans = ans.rstrip(ans[-1])
     else : ans += x
print(ans)

Fixed code:
s = input()
ans = ''
for x in s :
     if x == 'B' :
          ans = ans[:-1]
     else : ans += x
print(ans)
Buggy code:
import sys

def I(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LMI(): return list(map(int, sys.stdin.readline().split()))
MOD = 10 ** 9 + 7


s = input()
stack = list()
for c in s:
    if c == 'B' and len(stack) > 0:
        stack.pop()
    else:
        stack.append(c)
print(''.join(stack))


Fixed code:
import sys

def I(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LMI(): return list(map(int, sys.stdin.readline().split()))
MOD = 10 ** 9 + 7


s = input()
stack = list()
for c in s:
    if c == 'B':
        if len(stack) > 0:
            stack.pop()
    else:
        stack.append(c)
print(''.join(stack))
Buggy code:
s=input()
length = len(s)
ary = []

for i in length:
  if s[i] != "B":
    ary.append(s[i])
  elif len(ary) != 0:
    ary.pop(-1)
    
print("".join(ary))

Fixed code:
s=input()
length = len(s)
ary = []

for i in range(length):
  if s[i] != "B":
    ary.append(s[i])
  elif len(ary) != 0:
    ary.pop(-1)
    
print("".join(ary))
Buggy code:
s=''
for c in input():s=[s[:-1],s+c][c=='B']
print(s)


Fixed code:
s = ''
for c in input():s=[s+c, s[:-1]][c == 'B']
print(s)
Buggy code:
s = input()
ans = ''
for i in s:
    if i == 'B':
        ans = ans[:-1]
    else:
        ans += i
        print(ans)
print(ans)

Fixed code:
s = input()
ans = ''
for i in s:
    if i == 'B':
        ans = ans[:-1]
    else:
        ans += i
print(ans)
Buggy code:
s =input()
ary = []
for c in s:
    if c == 'B':
        if len(ary) > 0:
            ary.pop()
    else:
        ary.append(c)
print(''join(ary))

Fixed code:
s =input()
ary = []
for c in s:
    if c == 'B':
        if len(ary) > 0:
            ary.pop()
    else:
        ary.append(c)
print(''.join(ary))
Buggy code:
s = input()

result = ''
for i in s:
  if (i == 'B'):
    if len(result) == 0:
      continue
    else:
      result = result[:-1]
      print(result)
  else:
    result = result + i

print(result)

Fixed code:
s = input()

result = ''
for i in s:
  if (i == 'B'):
    if len(result) == 0:
      continue
    else:
      result = result[:-1]
  else:
    result = result + i

print(result)
Buggy code:
s = input()

ans = ''
for i in s:
    if i == 'B':
        ans = ans[:-1]
    else
        ans += i
print(ans)

Fixed code:
s = input()
res = ''

for i in s:
    if i == 'B':
        res = res[:-1]
    else:
        res += i

print(res)
Buggy code:
r = []
for i in input():
    if 'B' == i:
        if r:
            r.pop()
    else:
        r.append(i)
print(''.join(r)

Fixed code:
r = []
for i in input():
    if 'B' == i:
        if r:
            r.pop()
    else:
        r.append(i)
print(''.join(r))
Buggy code:
s=input()
a=[]
for i in s:
	if i == 'B':
		a.pop()
	else:
		a.append(i)
print(''.join(a))

Fixed code:
s=input()
a=[]
for i in s:
	if i == 'B':
		if a:
			a.pop()
		else:
			pass
	else:
		a.append(i)
print(''.join(a))
Buggy code:
s = input()
z = []

for i in s:
  if i=="B":
    z.pop()
  else:
    z.append(i)

print("".join(z))

Fixed code:
s = input()
z = []

for i in s:
  if i=="B":
    if z:
      z.pop()
  else:
    z.append(i)

print("".join(z))
Buggy code:
l = list(input())

print(l)
list = []

for i in range(len(l)):
    if l[i] == 'B':
        if not list:
            continue
        else:
            del list[-1]
    else:
        list.append(l[i])

print(''.join(list))


Fixed code:
l = list(input())

list = []

for i in range(len(l)):
    if l[i] == 'B':
        if not list:
            continue
        else:
            del list[-1]
    else:
        list.append(l[i])

print(''.join(list))
Buggy code:
from collections import deque
s = list(str(input()))
ans = deque()
for i in s:
  if i == "B":
    if ans == []:
      continue
    else:
      ans.pop()
  else:
    ans.append(i)
print("".join(ans))

Fixed code:
from collections import deque
s = list(str(input()))
ans = deque()
for i in s:
  if i == "B":
    if ans == deque([]):
      continue
    else:
      ans.pop()
  else:
    ans.append(i)
print("".join(ans))
Buggy code:
arr =list(input())
ret=""
for st in arr:
  if(st == "B"):
    ret = ret[:len(st)-1]
  else:
    ret = ret + st
      
print(ret)
  

Fixed code:
arr =list(input())
ret=""
for st in arr:
  if(st == "B"):
    ret = ret[:len(ret)-1]
  else:
    ret = ret + st
      
print(ret)
Buggy code:
s = list(input())
new_list = ""
for i in s:
    if i != 'B':
        new_list +=i
    else:
        if(len(new_list) >= 2):
            new_list = new_list[-1]
        else:
            new_list = ""

print(new_list)

Fixed code:
s = list(input())
new_list = ""
for i in s:
    if i != 'B':
        new_list +=i
    else:
        if(len(new_list) >= 2):
            new_list = new_list[:-1]
        else:
            new_list = ""
print(new_list)
Buggy code:
# -*- coding : utf-8 -*-

S = str(input())

w = ""
for i in range(len(S)):
  if S[i] = "B":
    if w != "":
      w = ""
    else :
      w.remove(w[-1])
  else:
    w + S[i]

print(w)

Fixed code:
# -*- coding : utf-8 -*-

S = str(input())

w = ""

for i in range(len(S)) :
  if S[i] == "B" :
    if w == "":
      w = ""
    else :
      w = w[:-1]
  else :
    w = w + S[i]
    
print(w)
Buggy code:
s = input()
print(s)
ans = ''
for i in s:
    if i != 'B':
        ans += i
    else:
        ans = ans[:-1]
print(ans)

Fixed code:
s=input()
ans=""
for i in s:
    if i=="B":ans=ans[:-1]
    else:ans+=i
print(ans)
Buggy code:
S = list(input())
stack = []
stack.append(S.pop(0))

for s in S:
    if s == "B":
        if len(stack) > 0:
            stack.pop()
    else:
        stack.append(s)

print("".join(stack)

Fixed code:
S = list(input())
stack = []

for s in S:
    if s == "B":
        if len(stack) > 0:
            stack.pop()
    else:
        stack.append(s)

print("".join(stack))
Buggy code:
s = list(input())

S = []
for i in s:
    if i == 'B':
        if S != []:
            S.pop(-1)
        else:
            pass
    else:
        S.append(i)
S_s = ''
for i in S:
    S_s += i
    
print(i)

Fixed code:
s = list(input())

S = []
for i in s:
    if i == 'B':
        if S != []:
            S.pop(-1)
        else:
            pass
    else:
        S.append(i)
S_s = ''
for i in S:
    S_s += i
    
print(S_s)
Buggy code:
res = ''
for x in input():
    if x = 'B':
        res = res[:-1]
    else:
        res += x 
print(res)




Fixed code:
res = ''
for x in input():
    if x == 'B':
        res = res[:-1]
    else:
        res += x 
print(res)
Buggy code:
string=input()
ans=""
for x in string:
    if x!="b":
        ans+=x
    else:
        ans=ans[:-1]
print(ans)

Fixed code:
string=input()
ans=""
for x in string:
    if x!="B":
        ans+=x
    else:
        ans=ans[:-1]
print(ans)
Buggy code:

# S = input()
# ret = []
# for s in S:
#     if s == 'B' and len(s):
#         ret.pop()
#     else:
#         ret.append(s)
# print(''.join(ret))

Fixed code:
S = input()
ret = []
for s in S:
    if s == 'B':
        if len(ret):
            ret.pop()
    else:
        ret.append(s)
print(''.join(ret))
Buggy code:
s = input()
m = []

for c in s:
  if c == 'B':
    if s:
      m.pop()
  else:
    m.append(c)

print(''.join(m))

Fixed code:
s = input()
m = []

for c in s:
  if c == 'B':
    if m:
      m.pop()
  else:
    m.append(c)

print(''.join(m))
Buggy code:
s=str(input())
while(s.count("B")!=0):
  i=s.find("B")
  if i!=0:
    s=s[:i-1]+s[i+1:]
print(s)

Fixed code:
s=str(input())
while(s.count("B")!=0):
  i=s.find("B")
  if i!=0:
    s=s[:i-1]+s[i+1:]
  else:
    s=s[1:]
print(s)
Buggy code:
s = list(input())
try
    bs = s.index('B')
except:
    bs=-1

while bs != -1:
    if bs == 0:
        del s[bs]
    else:
        del s[bs-1]
        del s[bs-1]
    try:
        bs = s.index('B')
    except:
        bs = -1

print(''.join(s))


Fixed code:
s = list(input())
try:
    bs = s.index('B')
except:
    bs=-1

while bs != -1:
    if bs == 0:
        del s[bs]
    else:
        del s[bs-1]
        del s[bs-1]
    try:
        bs = s.index('B')
    except:
        bs = -1

print(''.join(s))
Buggy code:
S = list(input())
for key in S: 
    if key == "B":
      final_str = final_str[:-1]
    else:
      final_str.append(key)
print(''.join(final_str)

Fixed code:
S = list(input())
final_str = []
for key in S: 
    if key == "B":
      final_str = final_str[:-1]
    else:
      final_str.append(key)
print(''.join(final_str))
Buggy code:
import collections

S=input()
N=len(S)
D=collections.deque([])

for i in range(N):
  if S[i]=="B":
    D.pop()
  else:
    D.append(S[i])
    
print("".join(list(D)))

Fixed code:
import collections

S=input()
N=len(S)
D=collections.deque([])

for i in range(N):
  if S[i]=="B":
    if len(D):
      D.pop()
  else:
    D.append(S[i])
print("".join(list(D)))
Buggy code:
def main():
    s = list(input())
    ans = []
    for i in s:
        if i =='B':
            ans.pop(-1)
        else:
            ans.append(i)
    for i in ans:
        print(i,end='')

if __name__=='__main__':
    main()

Fixed code:
def main():
    s = list(input())
    ans = []
    for i in s:
        if i != "B":
            ans.append(i)
        elif ans:
            ans.pop(-1)
    for i in ans:
        print(i,end='')

if __name__=='__main__':
    main()
Buggy code:
s = input()
t = ''

for i in range(len(s)):
  if s[i] == 'B':
    t = t[:-1]
  else:
    t += i
    
print(t)

Fixed code:
s = input()
t = ''

for i in range(len(s)):
  if s[i] == 'B':
    t = t[:-1]
  else:
    t += s[i]
    
print(t)
Buggy code:
s = input()
n= len(s)
a=[]

for i in range(n):
    if s[i]!='B':
        a.append(s[i])
    else:
        del a[-1]
print(''.join(a))



Fixed code:
s = input()
n= len(s)
a=[]

for i in range(n):
    if s[i]!='B':
        a.append(s[i])
    else:
        if a!=[]:
            del a[-1]
print(''.join(a))
Buggy code:
S=input()

result = []
for c in list(S):
   if c == 'B' and len(result)>0:
     result.pop(-1)
   else :
     result.append(c)

print("".join(result))


Fixed code:
S=input()

result = []
for c in list(S):
   if c == 'B' and len(result)>0:
     result.pop(-1)
   elif c== 'B':
     result = []
   else :
     result.append(c)

print("".join(result))
Buggy code:
N=input()
ans=[]
for i in N:
    if i=='B' and not ans==[]:
        ans.pop()
    else:
        ans.append(i)
print(''.join(ans))

Fixed code:
N=input()
ans=[]
for i in N:
    if i=='B':
        if not ans==[]:
            ans.pop()
    else:
        ans.append(i)
print(''.join(ans))
Buggy code:
nyu=input()
shutu=[]
for i in nyu:
	if i=="0" or "1":
		shutu.append(i)
	else:
		if len(shutu)!=0:
			shutu.pop(-1)
kekka="".join(shutu)
print(kekka)

Fixed code:
nyu=input()
shutu=[]
for i in nyu:
	if i=="B":
		if len(shutu)!=0:
			shutu.pop(-1)
	else:
		shutu.append(i)
kekka="".join(shutu)
print(kekka)
Buggy code:
def bs(s):
  if s == "":
    return s
  else:
    return s[:-1]

s = input()
ans = ""
for c in s:
  if c == "b":
    ans = bs(ans)
  else:
    ans += c
print(ans)
    
    




Fixed code:
def bs(s):
  if s == "":
    return s
  else:
    return s[:-1]
 
s = input()
ans = ""
for c in s:
  if c == "B":
    ans = bs(ans)
  else:
    ans += c
print(ans)
Buggy code:
s=list(input())

ans=[]
for i in range(len(s)):
    if s[i]=='B' and len(ans)>0:
        ans.pop(-1)
    else:
        ans.append(s[i])
print(''.join(ans))

Fixed code:
s=list(input())

ans=[]
for i in range(len(s)):
    if s[i]=='B' and len(ans)>0:
        ans.pop(-1)
     
    elif s[i]!='B':
        ans.append(s[i])
print(''.join(ans))
Buggy code:
s = input()
from collections import deque
dq = deque()
for i in range(len(s)):
    if s[i] == "B":
        dq.pop()
        continue
    dq.append(s[i])
print("".join(dq))


Fixed code:
s = input()
from collections import deque
dq = deque()
for i in range(len(s)):
    if s[i] == "B":
        if len(dq) == 0:
            continue
        dq.pop()
        continue
    dq.append(s[i])
print("".join(dq))
Buggy code:
s = input()
ans =''
for i in s:
  if i =='B':
    ans = ans[0::-1]
  else:
    ans +=i
print(ans)

Fixed code:
s = input()
l =''
for i in s:
  if i =='B':
    l = l[0:-1]
  else:
    l +=i
print(l)
Buggy code:
s = list(input())
ans =''
for i in s:
  if i =='B':
    ans = ans[0::-1]
  else:
    ans +=i
print(ans)

Fixed code:
s = input()
ans =''
for i in s:
  if i =='B':
    ans = ans[0:-1]
  else:
    ans +=i
print(ans)
Buggy code:
a=''
for i in input():
    if i=='B':
        a=a[:-1]
    else:
        a+=x
print(a)

Fixed code:
a=''
for i in input():
    if i=='B':
        a=a[:-1]
    else:
        a+=i
print(a)