#include<bits/stdc++.h>
#define LINT long long int
#define ULINT unsigned long long int
#define INF 99999999999

using namespace std;

template<typename tmp>
void input(vector<tmp>& vc) {
    for (tmp& x : vc)
        cin >> x;
}
template<typename tmp>
void output(vector<tmp>& vc, string endll = " ", string endd = "\n") {
    for (tmp& x : vc)
        cout << x << endll;
    cout << endd;
}

void fun(vector<vector<int> > &vc, int fx, int fy) {
    queue<pair<int, int> > q;
    q.push({fx, fy});
    while (!q.empty()) {
        pair<int, int> t = q.front();
        int x = t.first, y = t.second;
        q.pop();
        if (vc[x - 1][y] == 1) {
            vc[x - 1][y] = 3;
            q.push({x - 1, y});
        }
        if (vc[x + 1][y] == 1) {
            vc[x + 1][y] = 4;
            q.push({x + 1, y});
        }
        if (vc[x][y + 1] == 1) {
            vc[x][y + 1] = 5;
            q.push({x, y + 1});
        }
        if (vc[x][y - 1] == 1) {
            vc[x][y - 1] = 6;
            q.push({x, y - 1});
        }
    }
}

int main(){
    int n, m, x, y;
    cin >> n >> m;
    vector<vector<int> > vc(n, vector<int>(m, 0));
    for (int i = 0; i < n; ++i)
        for (int j = 0; j < m; ++j) {
            char t;
            cin >> t;
            if (t == '.')
                vc[i][j] = 1;
            else
                if (t == 'S') {
                    x = i;
                    y = j;
                    vc[i][j] = 2;
                }
        }
    fun(vc, x, y);
    for (auto x : vc) {
        for (auto y : x) {
            switch (y) {
                case 0:
                cout << '#';
                break;
                case 1:
                cout << '.';
                break;
                case 2:
                cout << 'S';
                break;
                case 3:
                cout << 'D';
                break;
                case 4:
                cout << 'U';
                break;
                case 5:
                cout << 'L';
                break;
                case 6:
                cout << 'R';
                break;
            }
        }
        cout << endl;
    }

}