char a[][60];main(i,j,k,f){for(;j=gets(++i+a););
for(i++;f;j++)for(f=k=0;k<=i;k++)f+=a[k][j]||!(a[k][j]=k%i?32:35);
for(;f<=i;)printf("#%c%s#\n",f++%i?32:35,a+f);}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).