#include <bits/stdc++.h>
using namespace std;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int n, m;
    cin >> n >> m;
    vector<string> g(n+2);
    for (auto &s: g) cin >> s;

    bool bad = false;

    for (int i = 1, j; i <= n; i++) {
        if (g[i][0] == '.') continue;
        for (j = 1; j <= m; j++) {
            if (g[i][j] == g[i][0]) break;
            if (g[i][j] != 'x' && g[i][j] != '.') bad = true;
            if (g[i][j] == '.') {
                g[i][j] = g[i][0];
                break;
            }
        }
        if (j == m+1) {
            bad = true;
        }
    }
    for (int i = 1, j; i <= n; i++) {
        if (g[i][m+1] == '.') continue;
        for (j = m; j > 0; j--) {
            if (g[i][j] == g[i][m+1]) break;
            if (g[i][j] != 'x' && g[i][j] != '.') bad = true;
            if (g[i][j] == '.') {
                g[i][j] = g[i][m+1];
                break;
            }
        }
        if (j == 0) {
            bad = true;
        }
    }
    for (int j = 1, i; j <= m; j++) {
        if (g[0][j] == '.') continue;
        for (i = 1; i <= n; i++) {
            if (g[i][j] == g[0][j]) break;
            if (g[i][j] != 'x' && g[i][j] != '.') bad = true;
            if (g[i][j] == '.') {
                g[i][j] = g[0][j];
                break;
            }
        }
        if (i == n+1) {
            bad = true;
        }
    }
    for (int j = 1, i; j <= m; j++) {
        if (g[n+1][j] == '.') continue;
        for (i = n; i > 0; i--) {
            if (g[i][j] == g[n+1][j]) break;
            if (g[i][j] != 'x' && g[i][j] != '.') bad = true;
            if (g[i][j] == '.') {
                g[i][j] = g[n+1][j];
                break;
            }
        }
        if (i == 0) {
            bad = true;
        }
    }

    if (bad) {
        cout << "NO\n";
        return 0;
    }

    cout << "YES\n";
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cout << (g[i][j] == 'x' ? '.' : g[i][j]);
        }
        cout << '\n';
    }

    return 0;
}