/* -*- coding: utf-8 -*-
 *
 * 3544.cc:  No.3544 Robot on Torus (C++) - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_H = 1000;
const int MAX_W = 1000;

/* typedef */

/* global variables */

char ss[MAX_H][MAX_W + 4];
bool fs[MAX_H][MAX_W];

/* subroutines */

/* main */

int main() {
  int h, w;
  scanf("%d%d", &h, &w);
  for (int i = 0; i < h; i++) scanf("%s", ss[i]);

  int ry = -1, rx = -1;
  for (int i = 0; ry < 0 && i < h; i++)
    for (int j = 0; ry < 0 && j < w; j++)
      if (ss[i][j] == 'R') ss[i][j] = '.', ry = i, rx = j;

  fs[ry][rx] = true;
  for (;;) {
    int vy = (ry + 1) % h, vx = (rx + 1) % w;
    if (ss[vy][vx] == '#') break;
    if (fs[vy][vx]) { puts("loop"); return 0; }
    ry = vy, rx = vx;
    fs[ry][rx] = true;
  }

  printf("%d %d\n", ry + 1, rx + 1);
  
  return 0;
}