// #pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#include <bits/stdc++.h>
using namespace std;

#define PB emplace_back
#define int long long
#define ll long long
#define vi vector<int>
#define siz(a) ((int) ((a).size()))
#define rep(i, a, b) for (int i = (a); i <= (b); ++i)
#define per(i, a, b) for (int i = (a); i >= (b); --i)
void print(vi n) { rep(i, 0, siz(n) - 1) cerr << n[i] << " \n"[i == siz(n) - 1]; }

int a, b, c;
char s[1005][1005], t[1005][1005];

signed main() {
	// freopen(".in", "r", stdin);
	// freopen(".out", "w", stdout);
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	cin >> a >> b >> c;
	rep(i, 1, a) cin >> s[i] + 1 >> t[i] + 1;
	// rep(i, 1, a) cout << t[i] + 1 << endl;
	bool ans = 1;
	rep(i, 1, a) {
		bool p = 1, q = 0;
		rep(j, 1, b) p &= s[i][j] == '*';
		rep(j, 1, c) q |= t[i][j] == '*';
		ans &= p >= q;
	}
	ans ? cout << "Y" : cout << "N";
	return cerr << endl << 1.0 * clock() / CLOCKS_PER_SEC << endl, 0;
}