qyliang/CodeNanoFix huggingface dataset:
Buggy code:
s = list(input("ddd"))

flg = 0

for i in range(len(s)):
    if i % 2 ==1:
        if str(s[i]) == "R":
            flg = 1
    else:
        if str(s[i]) == "L":
            flg = 1

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

Fixed code:
s = list(input())

flg = 0

for i in range(len(s)):
    if i % 2 ==1:
        if str(s[i]) == "R":
            flg = 1
    else:
        if str(s[i]) == "L":
            flg = 1

if flg == 0:
    print("Yes")
else:
    print("No")
Buggy code:
for j in range(len(s)):
    if j % 2 == 0 and s[j] == "L":
        print("No")
        break
    elif j % 2 == 1 and s[j] == "R":
        print("No")
        break
    elif j == len(s) -1:
        print("Yes")

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

for j in range(len(s)):
    if (j % 2 == 0) and (s[j] == "L"):
        print("No")
        break
    elif (j % 2 == 1) and (s[j] == "R"):
        print("No")
        break
    elif j == len(s) - 1:
        print("Yes")
Buggy code:
O={'R','U','D'}
E={'L','U','D'}
S=input()
if set(S[::2]) <= O | set(S[1::2]) <= E:
  print('Yes')
else:
  print('No')

Fixed code:
O={'R','U','D'}
E={'L','U','D'}
S=input()
if set(S[::2]) <= O and set(S[1::2]) <= E:
  print('Yes')
else:
  print('No')
Buggy code:
S = input()
result = 'Yes'
for i in range(1, len(S)+1):
  print(i)
  if (i % 2 == 0 and S[i-1] == "R") or (i % 2 == 1 and S[i-1] == "L"):
      result = 'No'
      break
      
print(result)
      


Fixed code:
S = input()
result = 'Yes'
for i in range(1, len(S)+1):
  #print(i)
  if (i % 2 == 0 and S[i-1] == "R") or (i % 2 == 1 and S[i-1] == "L"):
      result = 'No'
      break
      
print(result)
Buggy code:
import copy
s=list(input())
a=copy.deepcopy(s)
b=copy.deepcopy(s)
a=a[0:-1:2]
b=b[1:-1:2]
resulta="L" in a
resultb="R" in b
if resulta == "False" and resultb == "False":
  print("Yes")
else:
  print("No")

Fixed code:
import copy
s=list(input())
a=copy.deepcopy(s)
b=copy.deepcopy(s)
a=a[0::2]
b=b[1::2]
resulta="L" in a
resultb="R" in b
if resulta == False and resultb == False:
  print("Yes")
else:
  print("No")
Buggy code:
n = str(input())

length = len(n)
flg = 0
for num in range(length):
    if (num+1)%2!=0:
        if n[num] == 'R' or n[num] == 'U' or n[num] == 'D':
            flg = 1
        else:
            break
    else:
        if n[num] == 'L' or n[num] == 'U' or n[num] == 'D':
            flg = 1
        else:
            break
if flg == 1:
    print('Yes')
else:
    print('No')

Fixed code:
n = str(input())

length = len(n)
flg = 0
for num in range(length):
    if (num+1)%2!=0:
        if n[num] == 'R' or n[num] == 'U' or n[num] == 'D':
            flg = 1
        else:
            flg = 0
            break
    else:
        if n[num] == 'L' or n[num] == 'U' or n[num] == 'D':
            flg = 1
        else:
            flg = 0
            break
if flg == 1:
    print('Yes')
else:
    print('No')
Buggy code:
s=input()

ans='No'

for i,ss in enumerate(s):
  if i%2==0:
    if ss =='R' or ss=='U' or ss=='D':
      ans ='Yes'
    else:
      ans='No'
  else:
    if ss=='L' or ss=='U' or ss=='D':
      ans='Yes'
    else:
      ans='No'
print(ans)

Fixed code:
s=input()

ans='No'

for i,ss in enumerate(s):
  if i%2==0:
    if ss =='R' or ss=='U' or ss=='D':
      ans ='Yes'
    else:
      ans='No'
      break
  else:
    if ss=='L' or ss=='U' or ss=='D':
      ans='Yes'
    else:
      ans='No'
      break
print(ans)
Buggy code:
s = input()
flag = 0

for i, c in enumerate(s):
  if (i % 2 == 0) & (c == "R"):
    flag = 1
  elif (i % 2 == 1) & (c == "L"):
    flag = 1

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

Fixed code:
s = input()
flag = 0

for i, c in enumerate(s):
  if (i % 2 == 0) and (c == "L"):
    flag = 1
  elif (i % 2 == 1) and (c == "R"):
    flag = 1

if flag == 1:
  print("No")
else:
  print("Yes")
Buggy code:
S = input()
li = list(S)
ans = "Yes"
for i in range(len(S)):
  if i % 2 == 0:
    if li[i] == "L":
      ans == "No"
  else:
    if li[i] == "R":
      ans == "No"
print(ans)

Fixed code:
S = input()
li = list(S)
ans = "Yes"
for i in range(len(S)):
  if i % 2 == 0:
    if li[i] == "L":
      ans = "No"
  else:
    if li[i] == "R":
      ans = "No"
print(ans)
Buggy code:
S = input()

for i in range(len(S)):
    if i % 2 == 0:
        if not S[i] in ('R', 'U', 'D'):
            print("No")
            break
    else:
        if not S[i] in ('L', 'U', 'D'):
            print("No")
else:
    print("Yes")

Fixed code:
S = input()

for i in range(len(S)):
    if i % 2 == 0:
        if not S[i] in ('R', 'U', 'D'):
            print("No")
            break
    else:
        if not S[i] in ('L', 'U', 'D'):
            print("No")
            break
else:
    print("Yes")
Buggy code:
S = list(input())

can = True

for i in range(len(S)):
    if (i % 2 == 0):
        if (S[i] != 'R'):
            can = False
            break
    else:
        if (S[i] == 'L'):
            can = False
            break
if (can):
    print("Yes")
else:
    print("No")


Fixed code:
S = list(input())

can = True

for i in range(len(S)):
    if (i % 2 != 0):
        if (S[i] == 'R'):
            can = False
            break
    else:
        if (S[i] == 'L'):
            can = False
            break
if (can):
    print("Yes")
else:
    print("No")
Buggy code:
import sys
a = list(input())
print(a)
for i in range(len(a)):
    if i%2 == 0:
        if a[i] == 'L':
            print('No')
            sys.exit()
    else:
        if a[i] == 'R':
            print('No')
            sys.exit()
print('Yes')


Fixed code:
import sys
a = list(input())
for i in range(len(a)):
    if i%2 == 0:
        if a[i] == 'L':
            print('No')
            sys.exit()
    else:
        if a[i] == 'R':
            print('No')
            sys.exit()
print('Yes')
Buggy code:
S=input()
isOK=True
for i in range(len(S)):
  if(i%2==1):
    if(S[i]=="L"):
      isOK=False
  else:
    if(S[i]=="R"):
      isOK=False
      
if(isOK):
  print("Yes")
else:
  print("No")

Fixed code:
S=input()
isOK=True
for i in range(len(S)):
  if((i+1)%2==1):
    if(S[i]=="L"):
      isOK=False
  else:
    if(S[i]=="R"):
      isOK=False
      
if(isOK):
  print("Yes")
else:
  print("No")
Buggy code:
S = list(str(input()))
print(S)
for i in range(len(S)) :
  if i % 2 == 1 and S[i] == "R" :
    print("No")
    break
  elif i % 2 == 0 and S[i] == "L" :
    print("No")
    break
else :
  print("Yes")

Fixed code:
S = list(str(input()))
for i in range(len(S)) :
  if i % 2 == 1 and S[i] == "R" :
    print("No")
    break
  elif i % 2 == 0 and S[i] == "L" :
    print("No")
    break
else :
  print("Yes")
Buggy code:
td = input()
o = td[1::2]   # rud
e = td[::2]    # lud
if "L" in o or "R" in e:
  print("No")
else:
  print("Yes")


Fixed code:
td = input()
o = td[::2]   # rud
e = td[1::2]    # lud
if "L" in o or "R" in e:
  print("No")
else:
  print("Yes")
Buggy code:
S = input()

p = 0

for i in range(len(S)):
  if i // 2 == 0:
    if S[i] == 'L':
      p += 1
  elif i // 2 == 1:
    if S[i] == 'R':
      p += 1
  if p == 1:
    break
      
if p != 0:
  print('No')
elif p == 0:
  print('Yes')

Fixed code:
S = input()

p = 0

for i in range(len(S)):
  if i % 2 == 0:
    if S[i] == 'L':
      p += 1
  elif i % 2 == 1:
    if S[i] == 'R':
      p += 1
  if p == 1:
    break
      
if p != 0:
  print('No')
elif p == 0:
  print('Yes')
Buggy code:
S=input()
flag=0
for i in range(0,len(S)):
  if i%2==1 and S[i]=='L':
    flag=1
  if i%2==0 and S[i]=='R':
    flag=1
if flag==0:
  print('Yes')
else:
  print('No')


Fixed code:
S=input()
flag=0
for i in range(0,len(S)):
  if i%2==0 and S[i]=='L':
    flag=1
  if i%2==1 and S[i]=='R':
    flag=1
if flag==0:
  print('Yes')
else:
  print('No')
Buggy code:
def main():
    S = input()
    ans = 'Yes'
    for i in range(len(S)):
        if ((i+1)//2==1 and S[i]=='L') or ((i+1)//2==0 and S[i]=='R'):
            ans == 'No'
            break
    print(ans)

if __name__ == '__main__':
    main()

Fixed code:
def main():
    S = input()
    ans = 'Yes'
    for i in range(len(S)):
        if ((i+1)%2==1 and S[i]=='L') or ((i+1)%2==0 and S[i]=='R'):
            ans = 'No'
            break
    print(ans)

if __name__ == '__main__':
    main()
Buggy code:
string = str(input())
flag = True
for i in range(len(string)):
	if (i+1)%2==0:
		if( string[i]!='L' and string!='U' and string[i]!='D' ):
			flag = False
			break
	else:
		if ( string[i]!='R' and string!='U' and string[i]!='D' ):
			flag = False
			break
if(flag):
	print("Yes")
else:
	print("No")

Fixed code:
string = str(input())
flag = True
for i in range(len(string)):
	if (i+1)%2==0:
		if( string[i]!='L' and string[i]!='U' and string[i]!='D' ):
			# print(string[i],i)
			flag = False
			break
	else:
		if ( string[i]!='R' and string[i]!='U' and string[i]!='D' ):
			flag = False
			# print(string[i],i)
			break
if(flag):
	print("Yes")
else:
	print("No")
Buggy code:
S = list(map(str, input()))
for i in range(len(S)):
  if i % 2 == 0:
    if S[i] == "L":
      unreadble += 1
  else:
    if S[i] == "R":
  	  unreadble += 1
if unreadble >= 1:
  print("No")
else:
  print("Yes")

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

Odd= S[0::2]
Even= S[1::2]

oddset  = {'R', 'U', 'D'}
evenset = {'L', 'U', 'D'}

if set(Odd)==oddset and set(Even)==evenset:
    ans = 'Yes'
else :
    ans = 'No'
print(ans)

Fixed code:
S = input()

Odd= S[0::2]
Even= S[1::2]

oddset  = {'R', 'U', 'D'}
evenset = {'L', 'U', 'D'}

if oddset >= set(Odd) and evenset >= set(Even):
    ans = 'Yes'
else :
    ans = 'No'
print(ans)
Buggy code:
s = list(input())
def easy_step(s) :
    s_odd = s[::2]
    s_even = [1::2]
    if ("L" in s_odd) or ("R" in s_even) :
        print("No")
    else :
        print("Yes")
easy_step(s)

Fixed code:
def easy_step(s) :
    s_odd = s[::2]
    s_even = s[1::2]
    if ("L" in s_odd) or ("R" in s_even) :
        print("No")
    else :
        print("Yes")
s = list(input())
easy_step(s)
Buggy code:
s = input()
n = len(s)
count = 0
for i in range(0, n, 2):
    if s[i] == 'R':
        count += 1
for i in range(1, n, 2):
    if s[i] == 'L':
        count += 1
if count == n:
    print("Yes")
else print("No")

Fixed code:
s = input()
n = len(s)
count = 0
for i in range(0, n, 2):
    if s[i] == 'R' or  s[i] == 'U' or s[i] == 'D':
        count += 1
for i in range(1, n, 2):
    if s[i] == 'L' or s[i] == 'U' or s[i] == 'D':
        count += 1
if count == n:
    print("Yes")
else:
    print("No")
Buggy code:
s=input()
even = ["L","U","D"]
odd = ["R", "U", "D"]
f = false
for i in range(len(s)):
  if i%2:
    if s[i] not in even:
      f = True
  else:
    if s[i] not in odd:
      f = True
if f:
  print("No")
else:
  print("Yes")

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

Fixed code:
order = input()
if "R" in order[1::2] or "L" in order[::2]:
  print("No")
else:
  print("Yes")
Buggy code:
S = list(input())
if False not in [i in "L" for i in S[::2]] or False not in [i in "R" for i in S[1::2]]:
	print("Yes")
else:
	print("No")

Fixed code:
S = list(input())
if False not in [i not in "L" for i in S[::2]] and False not in [i not in "R"for i in S[1::2]]:
	print("Yes")
else:
	print("No")
Buggy code:
s = list(input())
flag = True
for i, fs in enumerate(s):
    if not((i%2 == 0 and fs in ("L","U","D")) or (i%2 == 1 and fs in ("R","U","D"))):
        flag = False
if flag:
    print("Yes")
else:
    print("No")

Fixed code:
s = list(input())
flag = True
for i, fs in enumerate(s):
    i += 1
    if not((i%2 == 0 and fs in ("L","U","D")) or (i%2 == 1 and fs in ("R","U","D"))):
        flag = False
if flag:
    print("Yes")
else:
    print("No")
Buggy code:
a=input()
print(a[0::2],a[1::2])
if set(a[0::2])<=set(['R','U','D']) and set(a[1::2])<=set(['L','U','D']):
  print('Yes')
else:
  print('No')

Fixed code:
a=input()

if set(a[0::2])<=set(['R','U','D']) and set(a[1::2])<=set(['L','U','D']):
  print('Yes')
else:
  print('No')
Buggy code:
s = input()

n = len(s)

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

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

Fixed code:
s = input()

n = len(s)

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

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

for i in range(len(s)):
  if s[i]=="R" and i%2==0:
    print("No")
    exit()
    
  elif s[i]=="L" and i%2!=0:
    print("No")
    exit()
    
  else:
    print("Yes")

Fixed code:
s=input()

for i in range(len(s)):
  if s[i]=="L" and (i%2==0 or i==0):
    print("No")
    exit()
    
  elif s[i]=="R" and i%2!=0:
    print("No")
    exit()
    
  else:
    pass
  
print("Yes")
Buggy code:
s = list(input())
f = True
print(s)
for index, i in enumerate(s):
    if(index % 2 == 0):
        if(i == 'L'):
            f = False
            break
    if(index % 2 == 1):
        if(i == 'R'):
            f = False
            break
if(f):
    print('Yes')
else:
    print('No')


Fixed code:
s = list(input())
f = True
for index, i in enumerate(s):
    if(index % 2 == 0):
        if(i == 'L'):
            f = False
            break
    if(index % 2 == 1):
        if(i == 'R'):
            f = False
            break
if(f):
    print('Yes')
else:
    print('No')
Buggy code:
S = input()

odd = True
yes = True

for s in S:
    if odd:
        if s == "L":
            yes = False
            break
        odd = False
    else:
        if s == "R":
            yes = False
            break
        odd = True

print(S)

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


Fixed code:
S = input()

odd = True
yes = True

for s in S:
    if odd:
        if s == "L":
            yes = False
            break
        odd = False
    else:
        if s == "R":
            yes = False
            break
        odd = True

# print(S)

if yes:
    print("Yes")
else:
    print("No")
Buggy code:
li = list(input())
od = li[0::2]
ev = li[1::2]

for i in range(len(od)):
    if od[i] == "L" or od[i] == "U" or od[i] == "D":
        pass
    else:
        print("No")
        exit()
for j in range(len(ev)):
    if ev[j] == "R" or ev[j] == "U" or ev[j] == "D":
        pass
    else:
        print("No")
        exit()
        
print("Yes")

Fixed code:
li = list(input())
od = li[0::2]
ev = li[1::2]
for i in range(len(od)):
    if od[i] == "R" or od[i] == "U" or od[i] == "D":
        pass
    else:
        print("No")
        exit()
for j in range(len(ev)):
    if ev[j] == "L" or ev[j] == "U" or ev[j] == "D":
        pass
    else:
        print("No")
        exit()
print("Yes")
Buggy code:
s = str(input())

o = ['R','U','D']
e = ['L','U','D']
flag = 0
for idx ,i in enumerate(s):
  if (idx+1)%2 == 0 and not i in e:
    print('NO')
    flag = 1
    break
  if (idx+1)%2 != 0 and not i in o:
    print('NO')
    flag = 1
    break
if flag == 0:
  print('Yes')

Fixed code:
s = str(input())

o = ['R','U','D']
e = ['L','U','D']
flag = 0
for idx ,i in enumerate(s):
  if (idx+1)%2 == 0 and not i in e:
    print('No')
    flag = 1
    break
  if (idx+1)%2 != 0 and not i in o:
    print('No')
    flag = 1
    break
if flag == 0:
  print('Yes')
Buggy code:
s=input()
flag=True
for i in range(len(s)):
  if i%2==0 and s[i]=="R":
    flag=False
    break
  elif i%2==1 and s[i]=="L":
    flag = False
    break
if flag:
  print('Yes')
else:
  print('No')

Fixed code:
s = input()
a = True

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

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

for i in range(les(s)):
    if i%2==0 and s[i]=="L":
        a = False
    elif i%2 ==1 and s[i]=="R":
        a = False
if a:
    print("Yes")
else:
    print("No")

Fixed code:
s = list(input())
a = True

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

Fixed code:
s = input()
def checkEasy(s):
  for i in range(len(s)):
    if (i%2 == 0):
      if (s[i] == 'L'):
        return False
    else:
      if (s[i] == 'R'):
        return False
  return True
if (checkEasy(s)):
  print("Yes")
else:
  print("No")
Buggy code:
S = input()
even = [v for i, v in enumerate(S) if i % 2 == 0]
odd = [v for i, v in enumerate(S) if i % 2 == 1]
count = even.count("R") + odd.count("L")
print("Yes" if count == 0 else "No")

Fixed code:
S = input()
even = [v for i, v in enumerate(S) if i % 2 == 0]
odd = [v for i, v in enumerate(S) if i % 2 == 1]
count = even.count("L") + odd.count("R")
print("Yes" if count == 0 else "No")
Buggy code:
def receuve_input():
    input_string = str(input())
    return input_string

def judge_steppable(input_string):
    even_strings = [s for i,s in enumerate(input_string) if i % 2 == 0]
    odd_strings = [s for i,s in enumerate(input_string) if i % 2 == 1]

    if 'R' not in even_strings and 'L' not in odd_strings:
         print('Yes')
    else:
        print('No')

if __name__ == '__main__':
    input_string = receuve_input()
    judge_steppable(input_string)

Fixed code:
def receuve_input():
    input_string = str(input())
    return input_string

def judge_steppable(input_string):
    even_strings = [s for i,s in enumerate(input_string) if i % 2 == 1]
    odd_strings = [s for i,s in enumerate(input_string) if i % 2 == 0]

    if 'R' not in even_strings and 'L' not in odd_strings:
         print('Yes')
    else:
        print('No')

if __name__ == '__main__':
    input_string = receuve_input()
    judge_steppable(input_string)
Buggy code:
S=list(input())
a=S[::2]
c=S[1::2]
b='Yes'
for i in a:
  if i!='R' or i!='U' or i!='D':
    b='No'
for j in c:
  if j!='L' or i!='U' or i!='D':
    b='No'
print(b)


Fixed code:
S=list(input())
a=S[::2]
b='Yes'
for i in a:
  if i!='R' and i!='U' and i!='D':
    b='No'
    break
c=S[1::2]
for j in c:
  if j!='L' and j!='U' and j!='D':
    b='No'
    break
print(b)
Buggy code:
s = input()
n = len(s)
a = 0
if n % 2 == 0:
  for i in range(0,n+1,2):
    if s[i] == "R":
      a = 1
      break
  for i in range(1,n,2):
    if s[i] == "L":
      a = 1
      break
if n % 2 == 1:
  for i in range(0,n,2):
    if s[i] == "R":
      a = 1
      break
  for i in range(1,n+1,2):
    if s[i] == "L":
      a = 1
      break
if a == 0:
  print("Yes")
if a == 1:
  print("No")

Fixed code:
s = input()
n = len(s)
a = 0
if n % 2 == 0:
  for i in range(0,n,2):
    if s[i] == "L":
      a = 1
      break
  for i in range(1,n,2):
    if s[i] == "R":
      a = 1
      break
else:
  for i in range(0,n,2):
    if s[i] == "L":
      a = 1
      break
  for i in range(1,n,2):
    if s[i] == "R":
      a = 1
      break
if a == 0:
  print("Yes")
if a == 1:
  print("No")
Buggy code:
text = input()

flg = 0
for i in range(len(text)):
	if i%2 == 0:
		if text[i:i+1] != 'R' and text[i:i+1] and 'U' and text[i:i+1] != 'D':
			flg = 1
	else:
		if  text[i:i+1] != 'U' and text[i:i+1] and 'U' and text[i:i+1] != 'D':
			flg = 1
if flg == 1:
	print('No')
else:
	pring('Yes')

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

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

cnt = 0
for i in range(len(s)):
    if i%2 == 1:
        if s[i] == "R":
            cnt = 1
            break
    else:
        if s[i] == "L":
            cnt == 1
            break
if cnt == 0:
    print("Yes")
else:
    print("No")

Fixed code:
s = str(input())
 
cnt = 0
for i in range(0, len(s)):

    if i % 2 == 0:
        if s[i] == "L":
            cnt = 1
            break

    else:
        if s[i] == "R":
            cnt = 1
            break

if cnt == 0:
    print("Yes")
else:
    print("No")
Buggy code:
s = list(input())

a = 0
b = 0
ans = 0
for i in range(len(s)//2):
    if s[2*i] == "R" or s[2*i] == "U" or s[2*i] == "D":
        a += 1
    if s[2*i+1] == "L" or s[2*i+1] == "U" or s[2*i+1] == "D":
        b += 1
if len(s)%2 == 0:
    if a == (len(s)-1)//2 and b == len(s)//2:
        ans = 1
else:
    if a == (len(s))//2 and b == (len(s)-1)//2:
        ans = 1
if ans ==1:
    print("Yes")
else:
    print("No")


Fixed code:
s = list(input())

a = 0
b = 0
ans = 0

for i in range(len(s)):
    if i%2 == 0:
        if s[i] == "R" or s[i] == "U" or s[i] == "D":
            a += 1
    else:
        if s[i] == "L" or s[i] == "U" or s[i] == "D":
             b += 1

if len(s)%2 == 0:
    if a == (len(s))//2 and b == len(s)//2:
        ans = 1
else:
    if a == (len(s)+1)//2 and b == (len(s)-1)//2:
        ans = 1
if ans ==1:
    print("Yes")
else:
    print("No")
Buggy code:
s=str(input())
ans=0
for i in range(len(s)):
  if i%2==0:
    if s[i]=="L":
      ans+=1
  else:
    if s[i]=="R":
      ans+=0
      
if ans==0:
  print("Yes")
else:
  print("No")

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


Fixed code:
s = input()
i = 0
flag = True
for c in s:
  i += 1
  if (i % 2 == 0 and c == "R") or (i % 2 == 1 and c == "L"):
    print("No")
    exit(0)
print("Yes")
Buggy code:
S = input()
kisuu = S[::2]
guusuu = S[1:2]
hantei = []
ans = 0

for i in kisuu:
  if i == 'R' or i == 'U' or i == 'D':
    hantei.append('ok')
  else:
    hantei.append('no')

for j in guusuu:
  if j == 'L' or j == 'U' or j == 'D':
    hantei.append('ok')
  else:
    hantei.append('no')

ans = hantei.count('no')
if ans > 0:
  print('no')
else:
  print('yes')


Fixed code:
S = input()
kisuu = S[::2]
guusuu = S[1::2]
hantei = []
ans = 0

for i in kisuu:
  if i == 'R' or i == 'U' or i == 'D':
    hantei.append('ok')
  else:
    hantei.append('no')

for j in guusuu:
  if j == 'L' or j == 'U' or j == 'D':
    hantei.append('ok')
  else:
    hantei.append('no')

ans = hantei.count('no')
if ans > 0:
  print('No')
else:
  print('Yes')
Buggy code:
s = input()
o = s[::2]
e = s[1::2]

co = 'L' in o
ce = 'R' in e

if co or ce:
  print('Yes')
else:
  print('No')

Fixed code:
s = input()
o = s[::2]
e = s[1::2]
 
co = 'L' in o
ce = 'R' in e
 
if co or ce:
  print('No')
else:
  print('Yes')