#include <bits/stdc++.h>   using namespace std;   int main() {     int h, w, x, y, star = 0, sum, flag;     char arr[505][505];     cin >> h >> w;     for (int i = 1; i <= h; i++) {       for (int j = 1; j <= w; j++) {         cin >> arr[i][j];         if (arr[i][j] ==  * ) {           star++;           if (arr[i][j - 1] ==  *  && arr[i - 1][j] ==  * ) {             sum = 3;             x = i;             y = j;           }         }       }     }     if (sum == 3) {       if (arr[x][y + 1] ==  *  && arr[x + 1][y] ==  * ) {         sum = sum + 2;       }       if (sum == 5) {         flag = 1;         if (x + 2 <= h) {           for (int i = x + 2; i <= h; i++) {             if (arr[i][y] ==  * )               sum++;             else               break;           }         }         if (x - 2 > 0) {           for (int i = x - 2; i > 0; i--) {             if (arr[i][y] ==  * )               sum++;             else               break;           }         }         if (y + 2 <= w)           for (int i = y + 2; i <= w; i++) {             if (arr[x][i] ==  * )               sum++;             else               break;           }         if (y - 2 > 0) {           for (int i = y - 2; i > 0; i--) {             if (arr[x][i] ==  * )               sum++;             else               break;           }         }       }     }     if (star == sum && sum >= 5)       cout <<  YES ;     else       cout <<  NO ;     return 0;   }   