#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <set>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <cstdio>
#include <cstring>
#include <iterator>
#include <bitset>
#include <unordered_set>
#include <unordered_map>
#include <fstream>
#include <iomanip>
#include <cassert>
//#include <utility>
//#include <memory>
//#include <functional>
//#include <deque>
//#include <cctype>
//#include <ctime>
//#include <numeric>
//#include <list>
//#include <iomanip>

//#if __cplusplus >= 201103L
//#include <array>
//#include <tuple>
//#include <initializer_list>
//#include <forward_list>
//
//#define cauto const auto&
//#else

//#endif

using namespace std;


typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vint;
typedef vector<vector<int> > vvint;
typedef vector<long long> vll, vLL;
typedef vector<vector<long long> > vvll, vvLL;

#define VV(T) vector<vector< T > >

template <class T>
void initvv(vector<vector<T> > &v, int a, int b, const T &t = T()){
    v.assign(a, vector<T>(b, t));
}

template <class F, class T>
void convert(const F &f, T &t){
    stringstream ss;
    ss << f;
    ss >> t;
}

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define reep(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n) reep((i),0,(n))
#define ALL(v) (v).begin(),(v).end()
#define PB push_back
#define F first
#define S second
#define mkp make_pair
#define RALL(v) (v).rbegin(),(v).rend()
#define DEBUG
#ifdef DEBUG
#define dump(x)  cout << #x << " = " << (x) << endl;
#define debug(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
#else
#define dump(x) 
#define debug(x) 
#endif
#define LDcout(x,n) fixed<<setprecision(n)<<x

#define MOD 1000000007LL
#define EPS 1e-8
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3fLL
#define maxs(x,y) x=max(x,y)
#define mins(x,y) x=min(x,y)
int h,w;
bool check(pii a){
    if(0<=a.F&&a.F<h&&0<=a.S&&a.S<w) return true;
    return false;
}
void mainmain(){
    int n;cin>>n;
    rep(o,n){
        cin>>h>>w;
        vector<string> v(h);
        rep(i,h) cin>>v[i];
        string s;
        cin>>s;
        cin>>s;
        // dump(s);
        pii pos;
        int dx[]={0,0,1,-1};
        int dy[]={1,-1,0,0};
        string vec="v^><";
        string vec2="DURL";
        rep(i,h){
            rep(j,w){
                if(v[i][j]=='<'||v[i][j]=='^'||v[i][j]=='>'||v[i][j]=='v') pos=pii(i,j);
            }
        }
        // cout<<pos.F<<" "<<pos.S<<endl;
        rep(i,s.size()){
            // dump(s[i]);
            // rep(j,h) cout<<v[j]<<endl;
            // cout<<endl;
            if(s[i]=='S'){
                rep(j,4){
                    if(v[pos.F][pos.S]==vec[j]){
                        pii tmp=pos;
                        while(check(tmp)){
                            // cout<<tmp.F<<" "<<tmp.S<<endl;
                            if(v[tmp.F][tmp.S]=='*'){
                                v[tmp.F][tmp.S]='.';
                                break;
                            }
                            if(v[tmp.F][tmp.S]=='#'){
                                break;
                            }
                            tmp.F+=dy[j];
                            tmp.S+=dx[j];
                        }
                        break;
                    }
                }
            }
            else{
                pii npos=pos;
                rep(j,4){
                    if(s[i]==vec2[j]){
                        v[pos.F][pos.S]=vec[j];
                        npos.F+=dy[j];
                        npos.S+=dx[j];
                        if(check(npos)&&v[npos.F][npos.S]=='.'){
                            v[npos.F][npos.S]=v[pos.F][pos.S];
                            v[pos.F][pos.S]='.';
                            pos=npos;
                        }
                        break;
                    }
                }
            }
        }
        if(o) cout<<endl;
        rep(i,h){
            cout<<v[i]<<endl;
        }
    }
}


signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
      cout<<fixed<<setprecision(20);
    mainmain();
}