#include <cstdio>
#include <algorithm>
#include <list>
#include <set>
#include <queue>
using namespace std;

char bufor[20][20], drugie[20][20];
int R, C;

#define REP(i,n) for(int i = 0; i < (n); ++i)
#define FOR(i,a,b) for(int i = (a); i <= (b); ++i)
#define FORD(i,a,b) for(int i = (a); i >= (b); --i)
//#define PRINTF(args...) printf(args)
 #define PRINTF(args...)

inline char rev(char c) {
  if(c == 'X') return '.';
  return 'X';
}

inline void zmien(int x, int y) {
  drugie[x][y] = rev(drugie[x][y]);
  if(x > 0) drugie[x-1][y] = rev(drugie[x-1][y]);
  if(y > 0) drugie[x][y-1] = rev(drugie[x][y-1]);
  if(x < R-1) drugie[x+1][y] = rev(drugie[x+1][y]);
  if(y < C-1) drugie[x][y+1] = rev(drugie[x][y+1]);
}

void testcase(int r, int c) {
  R = r; C = c; int wynik = 10000;
  REP(i,R) {scanf("%s", bufor[i]);
  PRINTF("WCZYTANY: %s\n", bufor[i]);}
  REP(i, 1<<C) {
	REP(a,R) REP(b,C) drugie[a][b] = bufor[a][b];
	int res = 0;
	REP(j,C)
	  if(i & (1<<j)) {
		++res;
		zmien(0,j);
	  }
	FOR(a,1,R-1)
	  REP(b,C)
		if(drugie[a-1][b] == 'X'){ zmien(a, b); ++res; }
	bool dobrze = true;
	REP(a,R) REP(b,C)
	  if(drugie[a][b] == 'X') dobrze = false;
//	if(dobrze) {
	PRINTF("OK %d: ", res);
	if(res == 5) {
	  REP(a, R) {
		REP(b, C) PRINTF("%c", drugie[a][b]);
	  PRINTF("\n");
	}
	}
	REP(j, C)
	  if(i& (1<<j)) PRINTF("%d ", j);
	  PRINTF("\n");
	if(dobrze)
	wynik <?= res;
  //}
  }
  if(wynik == 10000) printf("Damaged billboard.\n");
  else printf("You have to tap %d tiles.\n", wynik);
}

int main() {
    int r,c;
	for(;;) {
	  scanf("%d%d", &r, &c);
	  if(r == 0 && c == 0) return 0;
	  testcase(r,c);
	}
    return 0;
}