public class LCS
{
   static String ans;

   public static int solveLCS(int i, int j, String x, String y, String s)
   {
      int sol1, sol2;

      if (i == 0 || j == 0)
      {
         if ( s.length() > ans.length() )
	    ans = s;

         return(0);
      }

      if ( x.charAt(i-1) == y.charAt(j-1) )
      {
         sol1 = solveLCS(i-1, j-1, x, y, x.charAt(i-1) + s);
         return(sol1 + 1);
      }
      else
      {
         sol1 = solveLCS(i-1, j, x, y, s);
         sol2 = solveLCS(i, j-1, x, y, s);
         return( (sol1 >= sol2) ? sol1 : sol2 );
      }
   }


   public static void main(String[] args)
   {

       String x = "abcabcabc";
       String y = "babacbab";
       int r;

       ans = "";

       r = solveLCS(x.length(), y.length(), x, y, "");

       System.out.println("Max length = " + r);
       System.out.println("LCS = " + ans);
   }

}