#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using vi=vector<int>;
using vvi=vector<vi>;
using vs=vector<string>;
using msi=map<string,int>;
using mii=map<int,int>;
using psi=pair<string,int>;
using pii=pair<int,int>;
using vlai=valarray<int>;
#define rep(i,n) for(int i=0;i<n;i++)
#define range(i,s,n) for(int i=s;i<n;i++)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define fs first
#define sc second
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define INF 1e9
#define EPS 1e-9
#define MOD (1e9+7)
void get(){}template<class H,class...T>void get(H&h,T&...t){cin>>h;get(t...);}
template<class T>void geti(T&a){for(auto&_:a)cin>>_;}
template<class T>void getii(T&a){for(auto&_:a)geti(_);}
void put(string d){}template<class H,class...T>void put(string d,H&h,T&...t){cout<<h;if(sizeof...(t))cout<<d;put(d,t...);}
template<class T>void puti(T&a,string d=" "){bool f=1;for(auto&_:a)cout<<(exchange(f,0)?"":d)<<_;cout<<endl;}
template<class T>void putii(T&a,string d=" "){for(auto&_:a)puti(_,d);}
#define dcl(...) ll __VA_ARGS__;get(__VA_ARGS__)
#define dclt(t,...) t __VA_ARGS__;get(__VA_ARGS__)
  
#define fs first
#define sc second
  
int main(){
    int w,h;
    while(cin>>w>>h,w){
        vector<vvi> tf(2,vvi(h+2,vi(w+2,1)));
		vvi f(h+2,vi(2*w+3,1));
        pair<pii,pii> curr;
        pair<pii,pii> stat;
        for(int i=1;i<=h;i++){
            rep(p,2){
                for(int j=1;j<=w;j++){
                    char c; cin>>c;
                    if(c=='.'){
                        tf[p][i][j]=0;
                    }else if(c=='%'){
                        tf[p][i][j]=0;
                        if(p==0){
                            stat.first={i,j};
                        }else{
                            stat.second={i,2*w+2-j};
                        }
                    }else if(c=='L'){
                        tf[p][i][j]=0;
                        curr.first={i,j};
                    }else if(c=='R'){
                        tf[p][i][j]=0;
                        curr.second={i,2*w+2-j};
                    }
                }
            }
            reverse(all(tf[1][i]));
			for(int j=1;j<=w;j++){
				f[i][j]=tf[0][i][j];
				f[i][j+w+1]=tf[1][i][j];
			}
        }
		
        //putii(f[0],"");
        //cout<<endl;
        //putii(f[1],"");
        //cout<<"======="<<endl;
          
        /*幅優先
            ・どちらか片方だけ動き、動いた先がゴールでない場合
            ・両方動き、かつ少なくともどちらかがそのマスを訪れたことがない場合
            だけ、探索する
        */
		vector<vector<bool>> is(2600,vector<bool>(2600,false));
  
        queue<pair<pii,pii>> que;
        que.push(curr);
        int y[]={-1,0,1,0};
        int x[]={0,1,0,-1};
        auto step=[f](pii &pos, int y, int x){
            if(f[pos.fs+y][pos.sc+x]!=1){
                pos.fs+=y;
                pos.sc+=x;
                return true;
            }
            return false;
        };
        bool ok=false;
        while(!que.empty()){
            auto c=que.front();
            que.pop();
            //cout<<c[0][0]<<","<<c[0][1]<<"  "<<c[1][0]<<","<<c[1][1]<<endl;
            if(is[c.fs.fs*w+c.fs.sc][c.sc.fs*w+c.sc.sc-w-1]){
                continue;
            }
            is[c.fs.fs*w+c.fs.sc][c.sc.fs*w+c.sc.sc-w-1]=true;
            rep(v,4){
                auto next=c;
                bool l=step(next.fs,y[v],x[v]);
                bool r=step(next.sc,y[v],x[v]);
                if(next==stat){
                    ok=true;
                    goto fin;
                }
  
                if(next.fs!=stat.fs and next.sc!=stat.sc and !is[next.fs.fs*w+next.fs.sc][next.sc.fs*w+next.sc.sc-w-1]){
                    if( l or r ){
                        //cout<<" o "<<next[0][0]<<","<<next[0][1]<<"  "<<next[1][0]<<","<<next[1][1]<<endl;
                        que.push(next);
                    }else{
                        //cout<<" x "<<next[0][0]<<","<<next[0][1]<<"  "<<next[1][0]<<","<<next[1][1]<<endl;
                    }
                }
            }
        }
        fin:;
        if(ok){
            cout<<"Yes"<<endl;
        }else{
            cout<<"No"<<endl;
        }
    }
    return 0;
}


Measured memory_bytes: 5724