Buggy python submission (verdict: Runtime Error):
import sys
S=input()
if len(S)>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if len(S)%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Fixed submission:
import sys
S=input()
n=len(S)
if n>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Buggy python submission (verdict: Runtime Error):
import sys
S=input()
if len(S)>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Fixed submission:
import sys
S=input()
n=len(S)
if n>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Buggy python submission (verdict: Runtime Error):
import sys
S=input()
if len(S)>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Fixed submission:
import sys
S=input()
n=len(S)
if n>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Buggy python submission (verdict: Runtime Error):
import sys
S=input()
if n>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Fixed submission:
import sys
S=input()
n=len(S)
if n>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Buggy python submission (verdict: Runtime Error):
import sys
S=input()
for i in range(n//2):
    s=S[2*i]
    if s=="L":
        print("No")
        sys.exit()
    s=S[2*i+1]
    if s=="R":
        print("No")
        sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")

Fixed submission:
import sys
S=input()
n=len(S)
if n>1:
    for i in range(n//2):
        s=S[2*i]
        if s=="L":
            print("No")
            sys.exit()
        s=S[2*i+1]
        if s=="R":
            print("No")
            sys.exit()
if n%2==1:
    s=S[-1]
    if s=="L":
        print("No")
        sys.exit()
print("Yes")