import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;


public class Main {

    public static void dfs(int x, int y, char way, StringBuilder[] result) {
        result[x].setCharAt(y, way);
        int[] dx = {-1, 0, 0, 1};
        int[] dy = {0, -1, 1, 0};
        char[] ways = {'D', 'R', 'L', 'U'};
        for (int i = 0; i < 4; i++) {
            int tox = x + dx[i];
            int toy = y + dy[i];
            if (result[tox].charAt(toy) == '.') {
                dfs(tox, toy, ways[i], result);
            }
        }
    }

    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        try {
            String in = bufferedReader.readLine();
            int n, m;
            String[] parsed = in.split(" ");
            n = Integer.parseInt(parsed[0]);
            m = Integer.parseInt(parsed[1]);
            String[] field = new String[n];
            StringBuilder[] result = new StringBuilder[n];
            int x = 0, y = 0;
            for (int i = 0; i < n; i++) {
                field[i] = bufferedReader.readLine();
                for (int j = 0; j < m; j++) {
                    if (field[i].charAt(j) == 'S') {
                        x = i;
                        y = j;
                    }
                }
                result[i] = new StringBuilder(field[i]);
            }
            bufferedReader.close();
            dfs(x, y, 'S', result);
            for (int i = 0; i < n; i++) {
                System.out.println(result[i].toString());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}