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#include <cstdio>
using namespace std;

int xxx[] = 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int h;
int w;
int b1[8][8];
int b2[8][8];

int xx[9][9][9][2][33];

void solve() {
	int p1 = 0;
	int p2 = 0;
	for (int r=0; r<h; ++r) for (int c=0; c<w; ++c) if (b1[r][c] == 1) p1 += r + c;
	for (int r=0; r<h; ++r) for (int c=0; c<w; ++c) if (b2[r][c] == 1) p2 += r + c;

	if (p1 % 2 != p2 % 2) { printf("0.0\n"); return; }

	int kr = 0;
	int dr[] = {-1, 1, 0, 0};
	int dc[] = {0, 0, -1, 1};
	int k = 0;
	for (int r=0; r<h; ++r) for (int c=0; c<w; ++c) if (b2[r][c] == 1) {
		++k;
		for (int q=0; q<4; ++q) {
			int rr = r + dr[q];
			int cc = c + dc[q];
			if (rr < 0 || cc < 0 || rr >= h || cc >= w) continue;
			if (b2[rr][cc] == 0)
				++kr;
		}
	}
	double res = kr * 2;
	long long sum = 0;
	for (int p=0; p<2; ++p) for (int m=1; m<=4*k; ++m) sum += 1LL * m * xx[k][h][w][p][m];
	fprintf(stderr, "k: %d, sum: %lld\n", k, sum);
	res /= sum;
	printf("%.17lf\n", res);
}

void init() {
	int off = 0;
	for (int k=1; k<=8; ++k)
	for (int h=1; h<=8; ++h)
	for (int w=h; w<=8; ++w)
	{
		if (k >= h*w) continue;
		for (int p=0; p<2; ++p) for (int m=1; m<=4*k; ++m) {
			int xxxx = xxx[off++];
			xx[k][h][w][p][m] = xx[k][w][h][p][m] = xxxx;
		}
	}
}

int main() {
	init();
	scanf("%d%d", &h, &w);
	for (int r=0; r<h; ++r) {
		char s[64];
		scanf("%s", s);
		for (int c=0; c<w; ++c) {
			b1[r][c] = s[c] == 'O' ? 1 : 0;
		}
	}
	for (int r=0; r<h; ++r) {
		char s[64];
		scanf("%s", s);
		for (int c=0; c<w; ++c) {
			b2[r][c] = s[c] == 'O' ? 1 : 0;
		}
	}

	solve();
	return 0;
}