#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
#define print(x) cout << #x << " = " << x << endl
#define pi acos(-1)
#define output(x) cout << x << endl

int main()
{
   int t,l=1;
   cin>>t;
   while(t--)
   {
      int n,i,j,first_i,first_j,last_i,last_j,f=0;
      cin>>n;
      char a[n+5][n+5];
      for(i=1;i<=n;i++)
        {
            for(j=1;j<=n;j++)
            {
                cin>>a[i][j];
                if(a[i][j]=='*')
                {
                    if(!f) first_i=i,first_j=j,f=1;
                    else
                        last_i=i,last_j=j;
                }
            }
        }
        if(first_i==last_i)
        {
            if(first_i==n) a[1][last_j]='*',a[1][first_j]='*';
            else
                a[n][first_j]='*',a[n][last_j]='*';
        }
        else if(first_j==last_j)
        {
            if(first_j==n) a[first_i][1]='*',a[last_i][1]='*';
            else
                a[first_i][n]='*',a[last_i][n]='*';
        }
        else
        {
            a[first_i][last_j]='*',a[last_i][first_j]='*';
        }//cout<<"test "<<l++<<endl;
        for(i=1;i<=n;i++)
        {
            for(j=1;j<=n;j++)
            {
                cout<<a[i][j];
            }cout<<endl;
        }
   }
    return 0;
}