rt，代码如下@一扶苏一

#include <bits/stdc++.h>
using namespace std;

int main(){
//	freopen(".in","r",stdin);
//	freopen(".out","w",stdout);
	string s;
	cin>>s;
	for(int i=0;i<s.length();i++){
		if(i%2==0) 
			if (!(s[i]=='R'||s[i]=='U'||s[i]=='D')){
				cout<<"No"<<endl;
				return 0;
			}
		if (i%2==1)
			if (!(s[i]=='L'||s[i]=='U'||s[i]=='D')){
				cout<<"No"<<endl;
				return 0;
			}
	}
	cout<<"Yes"<<endl;
	return 0;
}