qyliang/CodeNanoFix huggingface dataset:
Buggy code:
import sys
S = input()
L = len(S)
i = 0
while i < L:
  if L[i] not in ['R','U','D']:
    print('No')
    sys.exit(0)
  i+=2
i = 1
while i < L:
  if L[i] not in ['L','U','D']:
    print('No')
    sys.exit(0)
  i += 2
print('Yes')


Fixed code:
import sys
S = input()
L = len(S)
i = 0
while i < L:
  if S[i] not in ['R','U','D']:
    print('No')
    sys.exit(0)
  i+=2
i = 1
while i < L:
  if S[i] not in ['L','U','D']:
    print('No')
    sys.exit(0)
  i += 2
print('Yes')
Buggy code:
def inpl():
    return list(map(int, input().split()))


S = input()

p = re.compile(r'([^L][^R])*[^L]?$')

if p.match(S):
    print('Yes')
else:
    print('No')

Fixed code:
import re


def inpl():
    return list(map(int, input().split()))


S = input()

p = re.compile(r'([^L][^R])*[^L]?$')

if p.match(S):
    print('Yes')
else:
    print('No')
Buggy code:
s=list(input())
if not("L" in s[::2]):
  if not("R" in s[1::2]):
    print("Yes")
else:
  print("No")

Fixed code:

s=list(input())
if not("L" in s[::2]) and not("R" in s[1::2]):
    print("Yes")
else:
    print("No")
Buggy code:
S = input()
N = list(S)

ret = ""

for i in range(len(N)):
  if i%2 == 0:
    if N[i] == "R":
      ret = "Yes"
    elif N[i] == "U":
      ret = "Yes"
    elif N[i] == "D":
      ret = "Yes"
    else:
      ret = "No"
  else:
    if N[i] == "L":
      ret = "Yes"
    elif N[i] == "U":
      ret = "Yes"
    elif N[i] == "D":
      ret = "Yes"
    else:
      ret = "No"
      
print(ret)

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

ret = ""

for i in range(len(N)):
  if i%2 == 0:
    if N[i] == "R":
      ret = "Yes"
    elif N[i] == "U":
      ret = "Yes"
    elif N[i] == "D":
      ret = "Yes"
    else:
      ret = "No"
      break
  else:
    if N[i] == "L":
      ret = "Yes"
    elif N[i] == "U":
      ret = "Yes"
    elif N[i] == "D":
      ret = "Yes"
    else:
      ret = "No"
      break
      
print(ret)
Buggy code:
S=input()
count=0
Ans=True
for i in range(len(S)):
    if i%2==1 and S[i]=="R":
        Ans=False
    elif i%2==0 and S[i]=="L": 
        Ans=False
print(Ans)

Fixed code:
S=input()
count=0
Ans=True
for i in range(len(S)):
    if i%2==1 and S[i]=="R":
        Ans=False
    elif i%2==0 and S[i]=="L": 
        Ans=False
if Ans==True:
    print("Yes")
else:
    print("No")
Buggy code:
S=input()
a=S[::2]
b=S[1::2]
if 'L' not in a:
	if 'R' not in b:
		print('Yes')
    else:
    	print('No')
else:
	print('No')

Fixed code:
S=input()
a=S[::2]
b=S[1::2]
if 'L' not in a:
	if 'R' not in b:
		print('Yes')
	elif 'R' in b:
		print('No')
elif 'L' in a:
	print('No')
Buggy code:
S = input()
for i in range(len(S)+1):
  if i == len(S):
    print('Yes')
    break
  if S[i] =='U' or S[i] =='D':
    pass
  else:
    if S[i] % 2 ==0:
      if S[i] == 'R':
        pass
      else:
        print('No')
        break
    else:
      if S[i]== 'L':
        pass
      else:
        print('No')
        break
        
      
    

Fixed code:
S = input()
for i in range(len(S)+1):
  if i == len(S):
    print('Yes')
    break
  if S[i] =='U' or S[i] =='D':
    pass
  else:
    if i % 2 ==0:
      if S[i] == 'R':
        pass
      else:
        print('No')
        break
    else:
      if S[i]== 'L':
        pass
      else:
        print('No')
        break
Buggy code:
s = str(input())
Odd = s[::2]
Even = s[1::2]
Ocount =0
Ecount =0
for i in range(len(Odd)):
  if Odd[i] == "R" or Odd[i] == "U" or Odd[i] == "D":
     Ocount +=1
  if(Ocount == len(Odd)):
     print("Yes")
     quit()
for i in range(len(Even)):
  if Even[i] == "L" or Even[i] == "U" or Even[i] == "D":
    Ecount +=1
  if(Ecount == len(Even)):
    print("Yes")
    quit()
print("Not")

Fixed code:
s = str(input())
Odd = s[::2]
Even = s[1::2]
Ocount =0
Ecount =0
for i in range(len(Odd)):
  if Odd[i] == "R" or Odd[i] == "U" or Odd[i] == "D":
     Ocount +=1
     if len(Even)==0:
        print("Yes")
        quit()      
for i in range(len(Even)):
  if Even[i] == "L" or Even[i] == "U" or Even[i] == "D":
    Ecount +=1
  if Ecount == len(Even) and Ocount == len(Odd):
    print("Yes")
    quit()
print("No")
Buggy code:
 import re
 s = input()
 p = re.compile(r'^([^L][^R])*[^L]?$')
 if p.match(s):

 print("Yes")
 else:
 print("No")


Fixed code:
import re

s = input()
p = re.compile(r'^([^L][^R])*[^L]?$')
if p.match(s):
	print("Yes")
else:
	print("No")
Buggy code:
S = list(map(str,input()))
i = 1
ans = 0
for i in range(len(S)-1):
  if i%2 == 1:
    if S[i] == "L":
      ans = ans + 1
  else:
    if S[i] == "R":
      ans = ans + 1
if ans == 0:
  print("No")
else:
  print("Yes")

Fixed code:
S = list(map(str,input()))
i = 0
ans = 0
for i in range(len(S)):
  if (i+1)%2 == 1:
    if S[i] == "L":
      ans = ans + 1
  else:
    if S[i] == "R":
      ans = ans + 1
if ans == 0:
  print("Yes")
else:
  print("No")
Buggy code:
# -*- coding: utf-8 -*-
def main():
    S  = input()
    O_flag = 0
    E_flag = 0
    for i in range(0, len(S),2):
        if S[i]=="R" or S[i]=="U" or  S[i]=="D":
            O_flag = 1
            break
    for i in range(1, len(S),2):
        if S[i]=="L" or S[i]=="U" or  S[i]=="D":
            E_flag = 1
            break
    if O_flag ==1 and E_flag ==1:
        print("Yes")
    else:
        print("No")

if __name__ == '__main__':
    main()

Fixed code:
# -*- coding: utf-8 -*-
def main():
    S  = input()
    O_flag = 0
    E_flag = 0
    for i in range(0, len(S),2):
        if S[i]!="R" and S[i]!="U" and S[i]!="D":
            O_flag = 1
            break
    for i in range(1, len(S),2):
        if S[i]!="L" and S[i]!="U" and  S[i]!="D":
            E_flag = 1
            break
    if O_flag ==1 or E_flag ==1:
        print("No")
    else:
        print("Yes")

if __name__ == '__main__':
    main()
Buggy code:
S = input()
even = S[::2]
odd = S[1::2]
if 'L' in odd or 'R' on even:
  print('No')
else:
  print('Yes')

Fixed code:
S = input()
odd = S[::2]
even = S[1::2]
if ('L' in odd) or ('R' in even):
    print('No')
else:
    print('Yes')
Buggy code:
s = input()

odd = s[::2]
print(odd)

even = s[1::2]
print(even)

if "R" in even or "L" in odd:
     print("No")
else:
    print("Yes")

Fixed code:
s = input()

odd = s[::2]
# print(odd)

even = s[1::2]
# print(even)

if "R" in even or "L" in odd:
    print("No")
else:
    print("Yes")
Buggy code:
S = input()
count = 0
for i in range(len(S)):
    if i % 2 == 0:
        if S[i] == 'L' or S[i] == 'U' or S[i] == 'D':
            count += 1    
        
    else:
        if S[i] == 'R' or S[i] == 'U' or S[i] == 'D':
            count += 1
if count == len(S):
    print("Yes")
else:
    print('No')

Fixed code:
S = input()
count = 0
for i in range(len(S)):
    if i % 2 == 0:
        if S[i] == 'R' or S[i] == 'U' or S[i] == 'D':
            count += 1    
        
    else:
        if S[i] == 'L' or S[i] == 'U' or S[i] == 'D':
            count += 1
if count == len(S):
    print('Yes')
else:
    print('No')
Buggy code:
s=input()
if "L" in s[::2] and "R" in s[1::2]:
  print("No")
else:
  print("Yes")

Fixed code:
s=input()
if "L" in s[::2] or "R" in s[1::2]:
  print("No")
else:
  print("Yes")
Buggy code:

S = input()

N = len(S)

Ans = 1

for i in range(N):
  nTmp = (i+1) % 2
  
  if nTmp == 1 and S[i]=='L':
    Ans = 0
  if nTmp == 0 and S[i]=='R':
    Ans = 0

if Ans == 0:
  print('Yes')
else:
  print('No')


Fixed code:
S = input()
 
N = len(S)
 
Ans = 1
 
for i in range(N):
  nTmp = (i+1) % 2
  
  if nTmp == 1 and S[i]=='L':
    Ans = 0
  if nTmp == 0 and S[i]=='R':
    Ans = 0
 
if Ans == 1:
  print('Yes')
else:
  print('No')
Buggy code:
S = input()

#print(len(S))
flag= 0
for i in range(len(S)):
	#print(i,S[i])
	if i % 2 == 0:
		if S[i] != "L" and S[i] != "U" and  S[i] != "D":
			#print(i,S[i])
			flag = 1
	elif i % 2 !=0:
		if S[i] != "R" and S[i] != "U" and  S[i] != "D":
			#print(i,S[i])
			flag = 1

if flag == 0:
	print("Yes")
else:
	print("No")

Fixed code:
S = input()

#print(len(S))
flag= 0
for i in range(len(S)):
	#print(i,S[i])
	if i % 2 == 0:
		if S[i] == "L" :
			#print(i,S[i])
			flag = 1
	elif i % 2 !=0:
		if S[i] == "R" :
			#print(i,S[i])
			flag = 1

if flag == 0:
	print("Yes")
else:
	print("No")
Buggy code:
S = list(input())
k = 0 
for i in range(0, len(S)):
    if i+1 % 2 == 0:
        if S[i] in "LUD":
            k += 1
        else:
            print("No")
            exit()
    else:
        if S[i] in "RUD":
            k += 1
        else:
            print("No")
            exit()
if k >= 1:
    print("Yes")

Fixed code:
S = list(input())
k = 0 
for i in range(0, len(S)):
    if (i + 1) % 2 == 0:
        if S[i] in "LUD":
            k += 1
        else:
            print("No")
            exit()
    else:
        if S[i] in "RUD":
            k += 1
        else:
            print("No")
            exit()
if k >= 1:
    print("Yes")
Buggy code:
s=input()

for i in range(len(s)):
  if i % 2 == 0:
    if s[i] == 'L':
      print('No')
  else:
    if s[i] == 'R':
      print('No')

print('Yes')
    

Fixed code:
s=input()

for i in range(len(s)):
  if i % 2 == 0:
    if s[i] == 'L':
      print('No')
      exit(0)
  else:
    if s[i] == 'R':
      print('No')
      exit(0)

print('Yes')
Buggy code:
even = ('L','U','D')
odd = ('R','U','D')

step = (even,odd)
s = input()
for i in range(len(s)):
  c = s[i]
  if c in step[i%2]:
    continue
  else:
    print('No')
    break
else:
  print('Yes')

Fixed code:
even = ('L','U','D')
odd = ('R','U','D')

step = (even,odd)
s = input()
for i in range(len(s)):
  c = s[i]
  if c in step[1- i%2]:
    continue
  else:
    print('No')
    break
else:
  print('Yes')
Buggy code:
S=list(input())

K="Yes"

for i in range (0,len(S)):
	if i%2=0
	    if S[i]=="L" :
        	K="No"
        	break
        else:
        	continue
    else :
		if S[i]=="R" :
        	K="No"
        	break
    	else:
        	continue
print(K)

Fixed code:
S=list(input())
K="Yes"
for i in range (0,len(S)):
	if i%2==0:
		if S[i]=="L" :
			K="No"
			break
		else:
			continue
	else :
		if S[i]=="R" :
			K="No"
			break
		else:
			continue
print(K)
Buggy code:
s = list(input())
for i in range(1,len(s)+1):
    if i%2 == 0:
        if s[i-1] == "L":
            print("No")
            exit()
    else:
        if s[i-1] == "R":
            print("No")
            exit()
print("Yes")

Fixed code:
s = list(input())
for i in range(1,len(s)+1):
    if i%2 == 0:
        if s[i-1] == "R":
            print("No")
            exit()
    else:
        if s[i-1] == "L":
            print("No")
            exit()
print("Yes")
Buggy code:
S = list(input())

even_list = ['R', 'U', 'D']
odd_list = ['L', 'U', 'D']

is_even = all(list(map(lambda x: x in even_list, S[1::2])))
is_odd = all(list(map(lambda x: x in odd_list, S[0::2])))

if is_even and is_odd:
    print('Yes')
else:
    print('No')


Fixed code:
S = list(input())

even_list = ['R', 'U', 'D']
odd_list = ['L', 'U', 'D']

is_even = all(list(map(lambda x: x in even_list, S[0::2])))
is_odd = all(list(map(lambda x: x in odd_list, S[1::2])))

if is_even and is_odd:
    print('Yes')
else:
    print('No')
Buggy code:
a = input()
for i in range(len(1,a+1)):
  if i%2 == 0:
    if a[i] == 'R':
      print('No')
      exit()
  else:
    if a[i] =='L':
      print('No')
      exit()
print('Yes')

Fixed code:
a = input()
for i in range(1,len(a)+1):
  if i%2 == 0:
    if a[i-1] == 'R':
      print('No')
      exit()
  else:
    if a[i-1] =='L':
      print('No')
      exit()
print('Yes')
Buggy code:
Tap = input()
L_Tap = len(Tap)

Flag = 0

for i in range(L_Tap):
  if i % 2 == 0:
    if Tap[i] == 'R' or Tap[i] == 'U' or Tap[i] == 'D':
      Flag = 0
    else:
      Flag = 1
  else:
    if Tap[i] == 'L' or Tap[i] == 'U' or Tap[i] == 'D':
      Flag = 0
    else:
      Flag = 1

if Flag == 0:
  print('Yes')
else:
  print('No')

Fixed code:
Tap = input()
L_Tap = len(Tap)
 
Flag = 0
 
for i in range(L_Tap):
  if i % 2 == 0:
    if Tap[i] == 'R' or Tap[i] == 'U' or Tap[i] == 'D':
      Flag = 0
    else:
      Flag = 1
      break
  else:
    if Tap[i] == 'L' or Tap[i] == 'U' or Tap[i] == 'D':
      Flag = 0
    else:
      Flag = 1
      break
 
if Flag == 0:
  print('Yes')
else:
  print('No')
Buggy code:
S=input()

def ans141(S:str):
    judge=0

    for i in range(0,len(S)):
        if (i+1)%2==1:
            if S[i]=="R" or "U" or "D":
                continue
            else:
                judge+=1
        else:
            if S[i]=="L" or "U" or "D":
                continue
            else:
                judge+=1
    if judge>0:
        return "No"
    else:
        return "Yes"

print(ans141(S))

Fixed code:
S=input()

def ans141(S:str):
    judge=0

    for i in range(0,len(S)):
        if (i+1)%2==1:
            if S[i]=="R" or S[i]=="U" or S[i]=="D":
                continue
            else:
                judge+=1
        else:
            if S[i]=="L" or S[i]=="U" or S[i]=="D":
                continue
            else:
                judge+=1
    if judge>0:
        return "No"
    else:
        return "Yes"

print(ans141(S))
Buggy code:
S = input()

for s in S[0::2]:
    if s != 'R' and s != 'U' and s != 'D':
        print('No')
        quit()

for i in S[1::2]:
    if S[i] != 'L' and S[i] != 'U' and S[i] != 'D':
        print('No')
        quit()

print('Yes')


Fixed code:
S = input()

for s in S[0::2]:
    if s != 'R' and s != 'U' and s != 'D':
        print('No')
        quit()

for s in S[1::2]:
    if s != 'L' and s != 'U' and s != 'D':
        print('No')
        quit()

print('Yes')
Buggy code:
S=input()
if "L" in S[::2] or "R"in S[1::2]:
    print("Yes")
else:
    print("No")

Fixed code:
S=input()
if "L" in S[::2] or "R"in S[1::2]:
    print("No")
else:
    print("Yes")
Buggy code:
S = input()
flg = 0
for i in range(len(S)):
    if (i+1)%2==0:
        if (S[i]!="R") & (S[i]!="U") & (S[i]!="D"):
            flg = 1
    else:
        if (S[i]!="L") & (S[i]!="U") & (S[i]!="D"):
            flg = 1
if flg == 0:
    print("Yes")
else:
    print("No")

Fixed code:
S = input()
flg = 0
for i in range(len(S)):
    if (i+1)%2==1:
        if (S[i]=="R") or (S[i]=="U") or (S[i]=="D"):
            flg += 1
    else:
        if (S[i]=="L") or (S[i]=="U") or (S[i]=="D"):
            flg += 1
if flg == len(S):
    print("Yes")
else:
    print("No")
Buggy code:
S = input()
flag = 0
for index, word in enumerate(S):
  if (word == 'U' or word == 'D') or (index%2 == 0 and word == 'L') or (index%2 == 0 and word == 'R'):
    pass
  else:
    flag = 1
    break;
print('Yes' if flag ==0 else 'No')

Fixed code:
S = input()
flag = 0
for index, word in enumerate(S):
    if (word == 'U' or word == 'D') or (index%2 == 1 and word == 'L') or (index%2 == 0 and word == 'R'):
        pass
    else:
        flag = 1
        break;
print('Yes' if flag ==0 else 'No')
Buggy code:

s = list(input())

for i in range(1,len(s)+1):
    if i % 2 == 1:
        if s[i-1] == "L":
            print("No")
            exit()
    else:
        if s[i-1] == "R":
            print("Yes")
            exit()
print("Yes")




Fixed code:

s = list(input())

for i in range(1,len(s)+1):
    if i % 2 == 1:
        if s[i-1] == "L":
            print("No")
            exit()
    else:
        if s[i-1] == "R":
            print("No")
            exit()
print("Yes")
Buggy code:
S = input()
res = "Yes"
for n in range(int(len(S/2))):
  if S[2*n+1] not in ["R","U","D"]:
    res = "No"
  if S[2*n] not in ["L","U","D"]:
    res = "No"
print(res)

Fixed code:
S = input()
res = "Yes"
for x in range(int(len(S)/2)+1):
  if 2*x < len(S):
    if S[2*x] not in ["R","U","D"]:
      res = "No"
  if 2*x + 1 < len(S):
    if S[2*x+1] not in ["L","U","D"]:
      res = "No"
print(res)
Buggy code:
import collections
S = input()

even = collections.defaultdict(int)
odd = collections.defaultdict(int)

for i in range(len(S)):
    if i % 2 == 0:
        odd[S[i]] += 1
    else:
        even[S[i]] += 1

odd = list(odd.keys())
even = list(even.keys())

if "R" in odd:
    if odd.index("R") >= 0:
        odd.pop(odd.index("R"))
if "U" in odd:
    if odd.index("U") >= 0:
        odd.pop(odd.index("U"))
if "D" in odd:
    if odd.index("D") >= 0:
        odd.pop(odd.index("D"))

if len(odd) != 0:
    print("No")
    exit(0)

if "L" in even:
    if even.index("L") >= 0:
        even.pop(even.index("L"))
if "U" in even:
    if even.index("U") >= 0:
        even.pop(even.index("U"))
if "D" in even:
    if even.index("D") >= 0:
        even.pop(even.index("D"))

if len(odd) != 0:
    print("No")
else:
    print("Yes")


Fixed code:
import collections
S = input()

even = collections.defaultdict(int)
odd = collections.defaultdict(int)

for i in range(len(S)):
    if i % 2 == 0:
        odd[S[i]] += 1
    else:
        even[S[i]] += 1

odd = list(odd.keys())
even = list(even.keys())

if "R" in odd:
    if odd.index("R") >= 0:
        odd.pop(odd.index("R"))
if "U" in odd:
    if odd.index("U") >= 0:
        odd.pop(odd.index("U"))
if "D" in odd:
    if odd.index("D") >= 0:
        odd.pop(odd.index("D"))

if len(odd) != 0:
    print("No")
    exit(0)

if "L" in even:
    if even.index("L") >= 0:
        even.pop(even.index("L"))
if "U" in even:
    if even.index("U") >= 0:
        even.pop(even.index("U"))
if "D" in even:
    if even.index("D") >= 0:
        even.pop(even.index("D"))

if len(even) != 0:
    print("No")
else:
    print("Yes")
Buggy code:
S=input()
count=0
for i in range(1,len(S)):
  if i%2==0:
      if S[i-1]=='L':
        count+=1
  else:
      if S[i-1]=='R':
          count+=1
if count==0:
  print("Yes")
else:
  print("No")

Fixed code:
S=input()
count=0
for i in range(1,len(S)+1):
  if i%2==0:
      if S[i-1]=='R':
        count+=1
  else:
      if S[i-1]=='L':
          count+=1
if count==0:
  print("Yes")
else:
  print("No")
Buggy code:
S = input()
Mylist = list(S)
Rlist = ["R","U","D"]
Llist = ["L","U","D"]
ANSlist = []
for i in range(len(Mylist)):
    if i%2 == 1:
        if Mylist[i] in Rlist:
            ANSlist.append("Y")
    else:
        if Mylist[i] in Llist:
            ANSlist.append("Y")

if len(ANSlist) == len(Mylist):
    print("Yes")
else:
    print("No")

Fixed code:
S = input()
Mylist = list(S)
Rlist = ["R","U","D"]
Llist = ["L","U","D"]
ANSlist = []
for i in range(1,len(Mylist)+1):
    if i%2 == 1:
        if Mylist[i-1] in Rlist:
            ANSlist.append("Y")
    if i%2 == 0:
        if Mylist[i-1] in Llist:
            ANSlist.append("Y")

if len(ANSlist) == len(Mylist):
    
    print("Yes")
else:
    print("No")
Buggy code:
s = input()
n = 1
a = True
for c in s:
    if n % 2 == 0:
        if c == "L" or c == "U" or c == "D":
            continue
        else:
            a = False
            break
    else:
        if c == "R" or c == "U" or c == "D":
            continue
        else:
            a = False
            break
if a:
    print("Yes")
else:
    print("No")

Fixed code:
s = input()
n = 1
a = True
for c in s:
    if n % 2 == 0:
        if c == "L" or c == "U" or c == "D":
            n += 1
            continue
        else:
            a = False
            break
    else:
        if c == "R" or c == "U" or c == "D":
            n += 1
            continue
        else:
            a = False
            break
if a:
    print("Yes")
else:
    print("No")
Buggy code:
a=input().strip()
t=1
for i in range(len(a)):
  if i%2==0 and i not in ['R','U','D']:
    t=0
    break
  elif i%2!=0 and i not in ['L','U','D']:
    t=0
    break
if t==1:
  print('Yes')
else:
  print('No')

Fixed code:
a=input().strip()
t=1
for i in range(len(a)):
  if i%2==0 and a[i] not in ['R','U','D']:
    t=0
    break
  elif i%2!=0 and a[i] not in ['L','U','D']:
    t=0
    break
if t==1:
  print('Yes')
else:
  print('No')
Buggy code:
s = input()
s = list(s)
flag = True
temp = 0
for i in range(len(s)):
    temp += 1
    if temp % 2 == 1 :
        if s[i] == "R" or s[i] == "U" or s[i] == "D":
            continue
        else:
            flag = False
    elif temp % 2 == 0:
        if s[i] == "L" or s[i] == "U" or s[i] == "D":
            continue
        else:
            flaf = False

if flag:
    print("Yes")
else:
    print("No")

Fixed code:
s = input()
s = list(s)
flag = True
temp = 0
for i in range(len(s)):
    temp += 1
    if temp % 2 == 1 :
        if s[i] == "R" or s[i] == "U" or s[i] == "D":
            continue
        else:
            flag = False
    elif temp % 2 == 0:
        if s[i] == "L" or s[i] == "U" or s[i] == "D":
            continue
        else:
            flag = False

if flag:
    print("Yes")
else:
    print("No")
Buggy code:
S =input()

print('No' if S[::2] == 'L' or S[1::2] == 'R' else 'Yes')

Fixed code:
S =input()

print('No' if 'L' in S[::2] or 'R' in S[1::2] else 'Yes')
Buggy code:
s = input()

ans = "YES"

for i in range(len(s)):
        if i%2 == 0:
                if s[i] != 'R' and s[i] != 'U' and s[i] != 'D':
                        ans = "No"
        if i%2 == 1:
                if s[i] != 'L' and s[i] != 'U' and s[i] != 'D':
                        ans = "No"

print(ans)

Fixed code:
s = input()

ans = "Yes"

for i in range(len(s)):
        if i%2 == 0:
                if s[i] != 'R' and s[i] != 'U' and s[i] != 'D':
                        ans = "No"
        if i%2 == 1:
                if s[i] != 'L' and s[i] != 'U' and s[i] != 'D':
                        ans = "No"

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

s_1 = set(list(s[1::2]))
s_2 = set(list(s[0::2]))

if {"R","U","D"} >= s_1 and {"L","U","D"} >= s_2:
  print("Yes")
else:
  print("No")

Fixed code:
s=input()

if {"R","U","D"} >= set(list(s[0::2])) and {"L","U","D"} >= set(list(s[1::2])):
  print("Yes")
else:
  print("No")
Buggy code:
s = input()
count = 0

for i in range(0, len(s)):
    if i % 1 == 0:
        if s[i] == 'L':
            count += 1
    if i % 1 == 1:
        if s[i] == 'R':
            count += 1

if count == 0:
    print('Yes')
else:
    print('No')

Fixed code:
s = input()
count = 0

for i in range(0, len(s)):
    if i % 2 == 0:
        if s[i] == 'L':
            count += 1
    elif i % 2 == 1:
        if s[i] == 'R':
            count += 1

if count == 0:
    print('Yes')
else:
    print('No')
Buggy code:
S = list(input())
for i in range(0,len(S),2):
  if S[i] == 'R':
    print('No')
    exit()
for j in range(1,len(S),2):
  if S[j] == 'L':
    print('NO')
    exit()
print('Yes')

Fixed code:
S = list(input())
for i in range(0,len(S),2):
  if S[i] == 'L':
    print('No')
    exit()
for j in range(1,len(S),2):
  if S[j] == 'R':
    print('No')
    exit()
print('Yes')
Buggy code:
S = str(input())

num = 0
for i in range(len(S)):
    if i % 2 == 0:
        if S[i] == "L":
            num += 1
    else:
        if s[i] == "R":
            num += 1

if num == 0:
    print("Yes")
else:
    print("No")

Fixed code:
S = str(input())

num = 0
for i in range(len(S)):
    if i % 2 == 0:
        if S[i] == "L":
            num += 1
    else:
        if S[i] == "R":
            num += 1

if num == 0:
    print("Yes")
else:
    print("No")
Buggy code:
s = input()
l = len(s)
h = int(l/2)

if l % 2 ==0:
  for i in range(h):
    if s[2*i] == 'L' or s[2*i + 1] == 'R':
      print('No')
      break
  else:
    print('Yes')

else:
  for i in range(h-1):
    if s[2*i] == 'L' or s[2*i + 1] == 'R':
      print('No')
      break
  else:
    if s[l-1] == 'L':
      print('No')
    else:
      print('Yes')

Fixed code:
s = input()
l = len(s)
h = int(l/2)

if l % 2 ==0:
  for i in range(h):
    if s[2*i] == 'L' or s[2*i + 1] == 'R':
      print('No')
      break
  else:
    print('Yes')

else:
  for i in range(h):
    if s[2*i] == 'L' or s[2*i + 1] == 'R':
      print('No')
      break
  else:
    if s[l-1] == 'L':
      print('No')
    else:
      print('Yes')
Buggy code:
s=input()
test=0
i=0
n=len(s)
if n%2==0:
   while  i<n:
      if s[i]=="L":
         test+=1
      if s[i+1]=="R":
         test+=1
      i+=2
else:
   while i+1<n:
      if s[i]=="L":
         test+=1
      if s[i+1]=="R":
         test+=1
      i+=2
   else:
      if s[i+1]="L":
         test+=1
if test==0:
   print("Yes")
else:
   print("No")


Fixed code:
s=input()
test=0
i=0
n=len(s)
if n%2==0:
   while  i<n:
      if s[i]=="L":
         test+=1
      if s[i+1]=="R":
         test+=1
      i+=2
else:
   while i+1<n:
      if s[i]=="L":
         test+=1
      if s[i+1]=="R":
         test+=1
      i+=2
   else:
      if s[i]=="L":
         test+=1
if test==0:
   print("Yes")
else:
   print("No")