Fox Ciel has a board with *n* rows and *n* columns. So, the board consists of *n* × *n* cells. Each cell contains either a symbol '.', or a symbol '#'.

A cross on the board is a connected set of exactly five cells of the board that looks like a cross. The picture below shows how it looks.

Ciel wants to draw several (may be zero) crosses on the board. Each cross must cover exactly five cells with symbols '#', and any cell with symbol '#' must belong to some cross. No two crosses can share a cell.

Please, tell Ciel if she can draw the crosses in the described way.
The first line contains an integer *n* (3 ≤ *n* ≤ 100) — the size of the board.

Each of the next *n* lines describes one row of the board. The *i*-th line describes the *i*-th row of the board and consists of *n* characters. Each character is either a symbol '.', or a symbol '#'.
import sys
from functools import lru_cache, cmp_to_key
from heapq import merge, heapify, heappop, heappush
# from math import *
from collections import defaultdict as dd, deque, Counter as C
from itertools import combinations as comb, permutations as perm
from bisect import bisect_left as bl, bisect_right as br, bisect
from time import perf_counter
from fractions import Fraction
import copy
import time
starttime = time.time()
mod = int(pow(10, 9) + 7)
mod2 = 998244353
def data(): return sys.stdin.readline().strip()
def out(*var, end="\n"): sys.stdout.write(' '.join(map(str, var))+end)
def L(): return list(sp())
def sl(): return list(ssp())
def sp(): return map(int, data().split())
def ssp(): return map(str, data().split())
def l1d(n, val=0): return [val for i in range(n)]
def l2d(n, m, val=0): return [l1d(n, val) for j in range(m)]
try:
    # sys.setrecursionlimit(int(pow(10,6)))
    sys.stdin = open("input.txt", "r")
    # sys.stdout = open("../output.txt", "w")
except:
    pass

n=L()[0]
A=[list(input()) for i in range(n)]

def pos(A,count):
    if count==0:
        return 1
    for i in range(n):
        for j in range(n):
            if A[i][j]=="#":
                try:
                    if (A[i-1][j]+A[i+1][j]+A[i][j-1]+A[i][j+1])=="####":
                        A[i][j]="."
                        A[i-1][j]="."
                        A[i+1][j]="."
                        A[i][j-1]="."
                        A[i][j+1]="."
                        if pos(A,count-5):
                            return 1
                        A[i][j]="#"
                        A[i-1][j]="#"
                        A[i+1][j]="#"
                        A[i][j-1]="#"
                        A[i][j+1]="#"
                except:
                    continue
    return 0


count=0
for row in A:
    for ele in row:
        if ele=="#":
            count+=1
if count%5:
    print("NO")
    exit()
if pos(A,count):
    print("YES")
else:
    print("NO")
endtime = time.time()
# print(f"Runtime of the program is {endtime - starttime}")
