题解 | #推倒吧骨牌#

ss=input()
res=[]
ri=len(ss)
li=0
for i in range(len(ss)):
    res.append(ss[i])
    if ss[i]=='L':
        
        if ri==len(ss):
            res[li:i]=['L']*(i-li)

        else:
            res[ri:ri+int((i-ri+1)/2)]=['R']*int((i-ri+1)/2)
            res[ri+int((i-ri)/2)+1:]=['L']*int((i-ri+1)/2)
            ri=len(ss)
        li=i
    elif ss[i]=='R':
        if ri!=len(ss):
            res[ri:i]=['R']*(i-ri)
        ri=i
if li<ri<len(ss):
    res[ri:]=['R']*(len(ss)-ri)
ans=''.join(res)
print(ans)