#include<iostream>
#include<vector>
#include<map>
#include<bits/stdc++.h>
#include<set>
#include<cmath>
using namespace std;
int main()
{
   int t;
   cin>>t;
   for(int k=1;k<=t;k++)
   {
       int n;
       cin>>n;
       char A[n][n];
       int x1,y1,x2,y2;
       int64_t c=0;

       for(int i=0;i<n;i++)
       {
          for(int j=0;j<n;j++)
          {
              cin>>A[i][j];
              if(A[i][j]=='*'&&c==0)
              {
                  x1=i;
                  y1=j;
                  c++;
              }
              if(A[i][j]=='*'&&c==1)
              {
                  x2=i;
                  y2=j;
              }
          }
       }
       int64_t x3,y3,x4,y4;
       if(x1==x2)
       {
          if(x1!=n-1)
          {
              x3=x1+1;
              x4=x2+1;
              y3=y1;
              y4=y2;
          }
          else
          {
              x3=x1-1;
              x4=x2-1;
              y3=y1;
              y4=y2;
          }
       }
       else if(y1==y2)
       {
           if(y1!=n-1)
          {
              y3=y1+1;
              y4=y2+1;
              x3=x1;
              x4=x2;
          }
          else
          {
             y3=y1-1;
              y4=y2-1;
              x3=x1;
              x4=x2;
          }
       }
       else
       {
           x3=x1;
           x4=x2;
           y3=y2;
           y4=y1;
       }
       A[x3][y3]='*';
       A[x4][y4]='*';
       for(int i=0;i<n;i++)
       {
           for(int j=0;j<n;j++)
           {
               cout<<A[i][j];
           }
           cout<<endl;
       }

   }
}


