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

for i in range(len(S)):
    if i % 2 == 0 and S[i] == 'L':
        print('No')
        break
    if i % 2 == 1 and S[i] == 'R':
        print('No')
        break
print('Yes')
        

Fixed code:
S = input()
 
for i in range(len(S)):
    if i % 2 == 0 and S[i] == 'L':
        print('No')
        exit()
    if i % 2 == 1 and S[i] == 'R':
        print('No')
        exit()
print('Yes')
Buggy code:
import math
import time
from collections import defaultdict, deque
from sys import stdin, stdout
from bisect import bisect_left, bisect_right
s=input()
poss=True
for i in range(len(s)):
    if(i%2==0):
        if(s[i]!='R'or):
            poss=False
            break
    else:
        if(s[i]=='R'):
            poss=False
            break
if(poss):
    print("Yes")
else:
    print("No")

Fixed code:
import math
import time
from collections import defaultdict, deque
from sys import stdin, stdout
from bisect import bisect_left, bisect_right
s=input()
poss=True
for i in range(len(s)):
    if(i%2==0):
        if(s[i]=='L'):
            poss=False
            break
    else:
        if(s[i]=='R'):
            poss=False
            break
if(poss):
    print("Yes")
else:
    print("No")
Buggy code:
tap = input()
list = [str(i) for i in tap]
Even = list[0::2]
Odd = list[1::2]

if 'L' in Odd or 'R' in Even:
        print('No')
else:
        print('Yes')


Fixed code:
tap = input()
list = [str(i) for i in tap]
Even = list[1::2]
Odd = list[0::2]

if 'L' in Odd or 'R' in Even:
        print('No')
else:
        print('Yes')
Buggy code:
S = input()
if S[0::2].count("L") + S[1::2].count("R") = 0: print("Yes")
  else: print("No")



Fixed code:
S = input()
if S[0::2].count("L") + S[1::2].count("R") == 0: print("Yes")
else: print("No")
Buggy code:
s = str(input())
ans = 'Yes'
print(list(s))
for i in list(s)[0::2]:
    if i == 'L':
        ans = 'No'
for i in list(s)[1::2]:
    if i == 'R':
        ans = 'No'
print(ans)
    

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


Fixed code:
S = list(input())
frag = 0
for i in range(len(S)):
    if i % 2 == 0:
        if S[i] != "R" and S[i] != "U" and S[i] != "D":
            frag += 1
    if i % 2 == 1:
        if S[i] != "L" and S[i] != "U" and S[i] != "D":
            frag += 1
if frag != 0:
    print("No")
else:
    print("Yes")
Buggy code:
s = 'ULURU' #input()
cnt = 0
for i in range(1, len(s)+1):
    t = s[i-1]
    if i % 2 == 1:
        if t == 'R':
            cnt += 1
        elif t == 'U':
            cnt += 1
        elif t == 'D':
            cnt += 1
    else:
        if t == 'L':
            cnt += 1
        elif t == 'U':
            cnt += 1
        elif t == 'D':
            cnt += 1


if cnt == len(s):
    print('Yes')
else:
    print('No')

Fixed code:
s = input()
cnt = 0
for i in range(1, len(s)+1):
    t = s[i-1]
    if i % 2 == 1:
        if t == 'R':
            cnt += 1
        elif t == 'U':
            cnt += 1
        elif t == 'D':
            cnt += 1
    else:
        if t == 'L':
            cnt += 1
        elif t == 'U':
            cnt += 1
        elif t == 'D':
            cnt += 1


if cnt == len(s):
    print('Yes')
else:
    print('No')
Buggy code:
h = str(input())
h = list(h)
h2 = h[0::2]
h3 = h[1::2]
print(h2)
print(h3)
if 'L' in h2 or 'R' in h3 :
    print('No')
else:
    print('Yes')

Fixed code:
h = str(input())
h = list(h)
h2 = h[0::2]
h3 = h[1::2]
if 'L' in h2 or 'R' in h3 :
    print('No')
else:
    print('Yes')
Buggy code:
S = input()
flag = True
for i in range(len(S)):
  if i%2 == 0:
    if S[i] == 'R':
      flag = False
  if i%2 == 1:
    if S[i] == 'L':
      flag = False
if flag:
  print('Yes')
else:
  print('No')
    

Fixed code:
S = input()
flag = True
for i in range(len(S)):
  if i%2 == 1:
    if S[i] == 'R':
      flag = False
  if i%2 == 0:
    if S[i] == 'L':
      flag = False
if flag:
  print('Yes')
else:
  print('No')
Buggy code:
def main():
        
    S = input()
    
    if "L" in S[::2] or "R" in S[1::2] == True:
        print("No")
    else:
        print("Yes")

if __name__ == "__main__":
    main()

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

if __name__ == "__main__":
    main()
Buggy code:
S=input()
K=[]
G[]
for i in range(0,len(S),2):
  K.append(S[i])
  try:
    G.append(S[i+1])
  except:
    pass
if ('L' in K) or ('R' in G):
  print('No')
else:
  print('Yes')

Fixed code:
S=input()
K=[]
G=[]
for i in range(0,len(S),2):
  K.append(S[i])
  try:
    G.append(S[i+1])
  except:
    pass
if ('L' in K) or ('R' in G):
  print('No')
else:
  print('Yes')
Buggy code:
import sys
S = list(input())
S_odd = S[::2]
S_even = S[1::2]
easy_odd = ['R','U','D']
easy_even = ['L','U','D']

print('Yes') if set(S_odd).issubset(easy_odd) and set(S_even).issubset(easy_even) else 
    print('No'

Fixed code:
import sys
S = list(input())
S_odd = S[::2]
S_even = S[1::2]
easy_odd = ['R','U','D']
easy_even = ['L','U','D']

print('Yes') if set(S_odd).issubset(easy_odd) and set(S_even).issubset(easy_even) else print('No')
Buggy code:
s = input()
flg = 0
for i in range(len(s)):
  if i % 2 == 0 and s[i] == 'R':
    flg = 1
  if i % 2 == 1 and s[i] == 'L':
    flg = 1
if flg == 0:
  print('Yes')
else:
  print('No')

Fixed code:
s = input()
flg = 0
for i in range(len(s)):
  if i % 2 == 0 and s[i] == 'L':
    flg = 1
  if i % 2 == 1 and s[i] == 'R':
    flg = 1
if flg == 0:
  print('Yes')
else:
  print('No')
Buggy code:
s=list(input())
print(s)
odd = [s[i] for i in range(0, len(s), 2)]
even = [s[i] for i in range(1, len(s), 2)]
#print(odd,even)

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


Fixed code:
s=list(input())
#print(s)
odd = [s[i] for i in range(0, len(s), 2)]
even = [s[i] for i in range(1, len(s), 2)]
#print(odd,even)

if "R" in even or "L"in odd:
  print("No")
else:
  print("Yes")
Buggy code:
s = str(input())

flag = False

for i in range(len(s)):
#     print("aaa",s[i])
    if i % 2 == 0:
        if s[i] == "R" or s[i] == "U" or s[i] == "D":
#             print(s[i],"1")
            flag = True
        else:
            flag = False
            break
    elif i % 2 == 1:
        if s[i] == "L" or s[i] == "U" or s[i] == "D":
#             print(i,"2")
            flag = True
        else:
            flag = False
            break

if flag:
    print("Yes")
else:
    print("Np")

Fixed code:
s = str(input())

flag = False

for i in range(len(s)):
#     print("aaa",s[i])
    if i % 2 == 0:
        if s[i] == "R" or s[i] == "U" or s[i] == "D":
#             print(s[i],"1")
            flag = True
        else:
            flag = False
            break
    elif i % 2 == 1:
        if s[i] == "L" or s[i] == "U" or s[i] == "D":
#             print(i,"2")
            flag = True
        else:
            flag = False
            break

if flag:
    print("Yes")
else:
    print("No")
Buggy code:
S = list(input())
rtu = "Yes"
ks = 1
for i in S:
    if ks == 1:
        if i == "L":
            rtu = "No"
            ks = 0
            break
    elif ks == 0:
        if i == "R":
            rtu = "No"
            ks = 1
            break
print(rtu)

Fixed code:
S = list(input())
rtu = "Yes"
ks = 1
for i in S:
    if ks == 1:
        if i == "L":
            rtu = "No"
            ks = 0
            break
        else:
            ks = 0
    elif ks == 0:
        if i == "R":
            rtu = "No"
            ks = 1
            break
        else:
            ks = 1
print(rtu)
Buggy code:
s=input()

i=0
flug=0
for x in range(len(s)):
    if(i%2==1):
        if(s[i] =='L'):
            flug=1
            break
    else:
        if(s[i] =='R'):
            flug=1
            break

if(flug==1):
    print("No")
else:
    print("Yes")

Fixed code:
s=input()

i=0
flug=0
for x in range(1,len(s)+1):
    if(x%2==1):
        if(s[x-1] =='L'):
            flug=1
            break
    else:
        if(s[x-1] =='R'):
            flug=1
            break

if(flug==1):
    print("No")
else:
    print("Yes")
Buggy code:
s=list(input())

for i in range(len(s)):
  if i // 2 == 1:
    if s[i] == "R":
      print("No")
      break
  elif i // 2 == 0:
    if s[i] == "L":
      print("No")
      break
  if i == len(s)-1:
    print("Yes")

Fixed code:
s=list(input())

for i in range(len(s)):
  if i % 2 == 1:
    if s[i] == 'R':
      print("No")
      break
  elif i % 2 == 0:
    if s[i] == 'L':
      print("No")
      break
  if i == len(s)-1:
    print("Yes")
Buggy code:
S = input()

kisu = ['R', 'U', 'D']
gusu = ['L', 'U', 'D']

hard = 0
S = "RDULULDURURLRDULRLR"

for i in range(len(S)):
    moji = S[i]
    if i % 2 == 1:
#        print("{} th : {} is in  Kisu(R,U,D)".format(i,moji))
        if moji not in gusu:
            hard = 1
            break
        else:
            hard = 0
    if i % 2 == 0:
#        print("{} th : {} is in Gusu(L,U,D)".format(i,moji))
        if moji not in kisu:
            hard = 1
            break
        else:
            hard = 0
if hard == 0:
    print("Yes")
else:
    print("No")

Fixed code:
S = input()

kisu = ['R', 'U', 'D']
gusu = ['L', 'U', 'D']

hard = 0
#S = "RDULULDURURLRDULRLR"

for i in range(len(S)):
    moji = S[i]
    if i % 2 == 1:
#        print("{} th : {} is in  Kisu(R,U,D)".format(i,moji))
        if moji not in gusu:
            hard = 1
            break
    if i % 2 == 0:
#        print("{} th : {} is in Gusu(L,U,D)".format(i,moji))
        if moji not in kisu:
            hard = 1
            break
if hard == 0:
    print("Yes")
else:
    print("No")
Buggy code:
S=input()
total=0

for i in range(ren(S)):
    if  i%2=0:
        if  (S[i]=='R')or(S[i]=='U')or(S[i]=='D'):
            pass
        else:
            total+=1
    else:
        if  (S[i]=='L')or(S[i]=='U')or(S[i]=='D'):
            pass
        else:
            total+=1

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

Fixed code:
S=input()
total=0

for i in range(len(S)):
    if  (i%2)==0:
        if  (S[i]=='R')or(S[i]=='U')or(S[i]=='D'):
            pass
        else:
            total+=1
    else:
        if  (S[i]=='L')or(S[i]=='U')or(S[i]=='D'):
            pass
        else:
            total+=1

if  total==0:
    print('Yes')
else:
    print('No')
Buggy code:
s = list(input())

print(s)
flag = 0

for i in range(len(s)):
    if i%2==0:
        if s[i] == 'R':
            flag = 1
    else:
        if s[i] == 'L':
            flag = 1

if flag == 1:
    print('No')
else:
    print('Yes')


Fixed code:
s = list(input())

flag = 0

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


if flag == 1:
    print('No')
else:
    print('Yes')
Buggy code:
S = input()
N = len(S)
even_set = {S[i] for i in range(N) if i % 2 == 1}
odd_set = {S[i] for i in range(N) if i % 2 == 0}
even_Yes = {'L', 'U', 'D'}
odd_Yes = {'R', 'U', 'D'}
if even_set <= odd_Yes or odd_set <= odd_Yes:
    print('Yes')
else:
    print('No')

Fixed code:
S = input()
N = len(S)
even_set = {S[i] for i in range(N) if i % 2 == 1}
odd_set = {S[i] for i in range(N) if i % 2 == 0}
even_Yes = {'L', 'U', 'D'}
odd_Yes = {'R', 'U', 'D'}
if even_set <= even_Yes and odd_set <= odd_Yes:
    print('Yes')
else:
    print('No')
Buggy code:
S = input()

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

Fixed code:
S = list(input())

if 'L' in S[0::2] or 'R' in S[1::2]:
  print('No')
else:
  print('Yes')
Buggy code:
s = input()
f = 0
for i in range(len(s)):
  if i % 2 == 1 and not (s[i] == 'R' or s[i] == 'U' or s[i] == 'D'):
    f = 1
  if i % 2 == 0 and not (s[i] == 'L' or s[i] == 'U' or s[i] == 'D'):
    f = 1
if f:
  print("No")
else:
  print("Yes")

Fixed code:
s = input()
f = 0
for i in range(len(s)):
  if (i + 1) % 2 == 1 and not (s[i] == 'R' or s[i] == 'U' or s[i] == 'D'):
    f = 1
  if (i + 1) % 2 == 0 and not (s[i] == 'L' or s[i] == 'U' or s[i] == 'D'):
    f = 1
if f:
  print("No")
else:
  print("Yes")
Buggy code:
S = input()
N = len(S)

res = "Yes"
for i in range(N):
  if i % 2 == 1:
    if S[i] == "L":
      res = "No"
  else:
    if S[i] == "R":
      res = "No"

print(res)


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

res = "Yes"
for i in range(N):
  if (i+1) % 2 == 1:
    if S[i] == "L":
      res = "No"
  else:
    if S[i] == "R":
      res = "No"

print(res)
Buggy code:
s = [i.upper() for i in str(input())]

k = set('RUD')
g = set('LUD')


kk = set(s[::2])
gg = set(s[1::2])


if k == kk or g == gg:
    print('Yes')
else:
    print('No')


Fixed code:
s = [i.upper() for i in str(input())]

k = set('RUD')
g = set('LUD')


kk = set(s[::2])
gg = set(s[1::2])


if kk <= k and gg <= g:
    print('Yes')
else:
    print('No')
Buggy code:
S = input()
print("No" if "L" in "S[0::2] or "R" in S[1::2] else "Yes")

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

def main():
    S = list(input())
    for i, c in enumerate(S):
        if i % 2 == 1 and c == "L":
            print("No")
            return
        if i % 2 == 0 and c == "R":
            print("No")
            return
    print("Yes")

if __name__ == "__main__":
    main()
        
        



Fixed code:

def main():
    S = list(input())
    for i, c in enumerate(S):
        if i % 2 == 0 and c == "L":
            print("No")
            return
        if i % 2 == 1 and c == "R":
            print("No")
            return
    print("Yes")

if __name__ == "__main__":
    main()
Buggy code:
n = str(input())
d = []
p = []
i = 1
s = 1
l = 1
for k in n:
 if i % 2 == 0:
  if k == "R" or k == "U" or k == "D":
   pass
  else:
   pass
   s = 0
 else:
  if k == "L" or k == "U" or k == "D":
   pass
  else:
    pass
    l = 0
 i = i + 1
if s or l == "1":
 print("Yes")
else:
 print("No")

Fixed code:
n = str(input())
d = []
p = []
i = 1
s = 1
l = 1
for k in n:
 if i % 2 == 0:
  if k == "L" or k == "U" or k == "D":
   pass
  else:
   s = 0
 else:
  if k == "R" or k == "U" or k == "D":
   pass
  else:
    l = 0
 i = i + 1
#print(s,l)
if s and l == 1:
 print("Yes")
else:
 print("No")
Buggy code:
Dance = input()

import re

pattern1 = r"[^RUD]"
pattern2 = r"[^LUD]"

if re.search(pattern1, Dance[0::2]) and re.search(pattern2, Dance[1::2]):
  print("Yes")
else:
  print("No")
 
  

Fixed code:
Dance = input()

import re

pattern1 = r"[^RUD]"
pattern2 = r"[^LUD]"

if re.search(pattern1, Dance[0::2]) or re.search(pattern2, Dance[1::2]):
  print("No")
else:
  print("Yes")
Buggy code:
s=input()
flag = True
for i in range(n):
  if (i % 2 == 0 and s[i] == 'L') or (i % 2 == 1 and s[i] == 'R')
    flag = False
if flag:
  print("Yes")
else:
  print("No")

Fixed code:
s = input()
flag = True
for i in range(len(s)):
    if (i % 2 == 0 and s[i] == 'L') or (i % 2 == 1 and s[i] == 'R'):
        flag = False
if flag:
    print("Yes")
else:
    print("No")
Buggy code:
s = input()
a=0


for x in range(len(s)):
    if x%2 == 0:
        if s[x]=="R" or "U" or "D":
            a=a
        else:

            a=a+1
    else:
        if s[x] == "L" or "U" or "D":
            a=a
        else:
            a=a+1

if a==0 :
    print("Yes")

else:
    print("No")


Fixed code:
s = input()
a=0


for x in range(len(s)):
    if x%2 == 0:
        if s[x]=="R" or s[x]== "U" or s[x]== "D":
            a=a
        else:

            a=a+1
    else:
        if s[x] == "L" or s[x]== "U" or s[x]== "D":
            a=a
        else:
            a=a+1

if a==0 :
    print("Yes")

else:
    print("No")
Buggy code:
s=input()
for i in range(len(s)//2+1):
  if s[2*i]!='R' and s[2*i]!='U' and s[2*i]!='D' :
    print('No')
    exit()
  if s[2*i+1]!='L' and s[2*i+1]!='U' and s[2*i+1]!='D':
    print('No')
    exit()
if 
print('Yes')


Fixed code:
s=input()
if len(s)%2==0:
  for i in range(len(s)//2):
    if s[2*i]!='R' and s[2*i]!='U' and s[2*i]!='D' :
      print('No')
      exit()
    if s[2*i+1]!='L' and s[2*i+1]!='U' and s[2*i+1]!='D':
      print('No')
      exit()
if len(s)%2==1:
  for i in range(len(s)//2):
    if s[2*i+1]!='L' and s[2*i+1]!='U' and s[2*i+1]!='D':
      print('No')
      exit()
  for i in range(len(s)//2+1):
    if s[2*i]!='R' and s[2*i]!='U' and s[2*i]!='D' :
      print('No')
      exit()
print('Yes')
Buggy code:
import sys
stdin = sys.stdin

ns = lambda: stdin.readline().rstrip()
ni = lambda: int(stdin.readline().rstrip())
nm = lambda: map(int, stdin.readline().split())
nl = lambda: list(map(int, stdin.readline().split()))

S=list(ns())
S_o=str(S[0::2])
S_e=str(S[1::2])
print('Yes' if (not (S_o in 'L')) and (not (S_e in 'R')) else 'No')  

Fixed code:
import sys
stdin = sys.stdin

ns = lambda: stdin.readline().rstrip()
ni = lambda: int(stdin.readline().rstrip())
nm = lambda: map(int, stdin.readline().split())
nl = lambda: list(map(int, stdin.readline().split()))

S=list(ns())
S_o=''.join(S[0::2])
S_e=''.join(S[1::2])
print('Yes' if ((not ('L' in S_o)) and (not ('R' in S_e))) else 'No')
Buggy code:
s = input()
kisuu = ['R', 'U', 'D']
guusuu = ['L', 'U', 'D']
for i in s[::2]:
    if i in kisuu:
        continue
    else:
        print('No')
        quit()
for j in s[2::2]:
    if j in guusuu:
        continue
    else:
        quit()
print('Yes')

Fixed code:
s = input()
kisuu = ['R', 'U', 'D']
guusuu = ['L', 'U', 'D']
for i in s[::2]:
    if i in kisuu:
        continue
    else:
        print('No')
        quit()
for j in s[1::2]:
    if j in guusuu:
        continue
    else:
        print('No')
        quit()
print('Yes')
Buggy code:
S = list(input())
S_o = []
S_e = []
for i in range(len(S)):
    if i%2 == 0:
        S_e.append(S[i])
    elif i%2 == 1:
        S_o.append(S[i])
if ('L' not in set(S_o)) and ('R' not in set(S_e)):
    print('Yes')
else:
    print('No')

Fixed code:
S = list(input())
S_o = []
S_e = []
for i in range(len(S)):
    if i%2 == 0:
        S_e.append(S[i])
    elif i%2 == 1:
        S_o.append(S[i])
if ('R' not in set(S_o)) and ('L' not in set(S_e)):
    print('Yes')
else:
    print('No')
Buggy code:
S = list(map(str,input()))

odd = ['R','U','D']
even = ['L','U','D']

for i in range(len(S)):
    if (i+1) == 0:
        if S[i] in odd:
            print('No')
            exit()
    elif (i+1) == 0:
        if S[i] in even:
            print('No')
            exit()
print('Yes')

Fixed code:
S = list(map(str,input()))

odd = ['R','U','D']
even = ['L','U','D']

for i in range(len(S)):
    if (i+1)%2 == 0:
        if S[i] in 'R':
            print('No')
            exit()
    elif (i+1)%2 == 1:
        if S[i] in 'L':
            print('No')
            exit()
print('Yes')
Buggy code:
s = input()
x = len(s) - 1
m = 0
n = 1
c = 0
while m <= x:
  if s[m] == 'R':
    c += 1
  m += 2
while n <= x:
  if s[n] == 'L':
    c += 1
  n += 2
if c == 0:
  print('Yes')
else:
  print('No')

Fixed code:
s = input()
x = len(s) - 1
m = 0
n = 1
c = 0
while m <= x:
  if s[m] == 'L':
    c += 1
  m += 2
while n <= x:
  if s[n] == 'R':
    c += 1
  n += 2
if c == 0:
  print('Yes')
else:
  print('No')
Buggy code:
S=input()
a = 0
for i in renge(len(S)):
  if i%2==1 :
    S[i] != "L"
    a += 1
  else:
    S[i] != "R"
    a += 1
if a == len(S):
  print("Yes")
else:
  print("No")

Fixed code:
S=input()
a = 0
for i in range(len(S)):
  if i%2==0 :
    if S[i] != "L":
    	a += 1
  else:
    if S[i] != "R":
    	a += 1
if a == len(S):
  print("Yes")
else:
  print("No")
Buggy code:
steps = list(list(input()))
even = True
odd = True
for i in range(0, len(steps), 2):
    if not steps[i] == ('R' or "U" or "D"):
        odd = False

for i in range(1, len(steps), 2):
    if not steps[i] == ("L" or "U" or "D"):
        even = False

if even and odd:
    print("Yes")
else:
    print("No")

Fixed code:
steps = list(list(input()))
even = True
odd = True
for i in range(0, len(steps), 2):
    if not (steps[i] == 'R' or  steps[i] == 'U' or  steps[i] == 'D'):
        odd = False

for i in range(1, len(steps), 2):
    if not (steps[i] == 'L' or  steps[i] == 'U' or  steps[i] == 'D'):
        even = False

if even and odd:
    print("Yes")
else:
    print("No")
Buggy code:
n = input()

flag = True
for i in range(N):
  if i%2 == 0:
    if n[i] == 'R' or n[i] == 'U' or n[i] == 'D':
      pass
    else:
      flag = False
      
  else:
    if n[i] == 'L' or n[i] == 'U' or n[i] == 'D':
      pass
    else:
      flag = False
      
if flag:
  print('Yes')
else:
  print('No')
      

Fixed code:
n = input()

flag = True
for i in range(len(n)):
  if i%2 == 0:
    if n[i] == 'R' or n[i] == 'U' or n[i] == 'D':
      pass
    else:
      flag = False
      
  else:
    if n[i] == 'L' or n[i] == 'U' or n[i] == 'D':
      pass
    else:
      flag = False
      
if flag:
  print('Yes')
else:
  print('No')
Buggy code:
odd = ["R", "U", "D"]
even = ["L", "U", "D"]
s_list = list(input())

ans = "Yes"
for i in range(s_list):
  if i % 2 == 0:
	  if not data[i] in odd:
    	ans = "No"
  
  if i % 2 == 0:
	  if not data[i] in even:
    	ans = "No"

print(ans)

Fixed code:
odd = ["R", "U", "D"]
even = ["L", "U", "D"]
s_list = list(input())

ans = "Yes"
for i in range(len(s_list)):
  if i % 2 == 0:
    if not s_list[i] in odd:
      ans = "No"
  
  if i % 2 == 1:
    if not s_list[i] in even:
      ans = "No"

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

od = ["R","U","D"]
ev = ["L","U","D"]
flag = False
for i in range(len(s)):
    if i%2 ==0:
        if s[i] not in od:
            #print("No")
            break
        else:
            flag = True
    elif i%2 == 1:
        if s[i] not in ev:
            #print("No")
            break
        else:
            flag = True
if flag:      
    print("Yes")

Fixed code:
s=list(input())

od = ["R","U","D"]
ev = ["L","U","D"]
flag = False
for i in range(len(s)):
    if i%2 ==0:
        if s[i] not in od:
            flag = False#print("No")
            break
        else:
            flag = True
    elif i%2 == 1:
        if s[i] not in ev:
            flag = False#print("No")
            break
        else:
            flag = True
if flag:      
    print("Yes")
else:
    print("No")
Buggy code:
import sys
s = sys.stdin.readline()
flag = True
i = 0
while i < len(s):
  if i % 2:
    if s[i] != 'R' and s[i] != 'U' and s[i] != 'D':
      flag = False
      break
  else:
    if s[i] != 'L' and s[i] != 'U' and s[i] != 'D':
      flag = False
      break
  i += 1
if flag:
  print('Yes')
else:
  print('No')

Fixed code:
import sys
s = sys.stdin.readline().strip()
flag = True
i = 0
while i < len(s):
  if i % 2:
    if s[i] != 'L' and s[i] != 'U' and s[i] != 'D':
      flag = False
      break
  else:
    if s[i] != 'R' and s[i] != 'U' and s[i] != 'D':
      flag = False
      break
  i += 1
if flag:
  print('Yes')
else:
  print('No')