import java.io.*;
import java.util.*;
import java.text.DecimalFormat;
public class prob4
{


    public static void main (String[] args) throws IOException
    {
	//long q = System.currentTimeMillis ();
	BufferedReader in = new BufferedReader (new FileReader ("DATA4.txt"));
	PrintWriter out = new PrintWriter (new FileWriter ("OUT4.txt"), true);
	DecimalFormat f = new DecimalFormat ("0.00");
	StringTokenizer st;
	for (int a = 0 ; a < 5 ; a += 1)
	{
	    char my2DMap[] [] = new char [10] [10];
	    int myCounter = 0;
	    int myLive = 0;
	    int myOldLive = 0;

	    for (int i = 0 ; i < 10 ; i++)
	    {
		String s = in.readLine ();
		for (int j = 0 ; j < 10 ; j++)
		{
		    my2DMap [j] [i] = s.charAt (j);
		}
	    }

	    while (true)
	    {
		myOldLive = myLive;
		myLive = 0;

		for (int i = 0 ; i < 10 ; i++)
		{
		    for (int j = 0 ; j < 10 ; j++)
		    {
			if (my2DMap [j] [i] == 'T')
			{
			    myLive++;
			}
		    }
		}

		if (myLive == 0)
		{
		    break;
		}

		if (myOldLive == myLive)
		{
		    myCounter = -1;
		    break;
		}

		//actual
		for (int i = 0 ; i < 10 ; i++)
		{
		    for (int j = 0 ; j < 10 ; j++)
		    {
			if (my2DMap [j] [i] == 'F')
			{
			    if (j > 0)
			    {
				if (my2DMap [j - 1] [i] == 'T')
				{
				    my2DMap [j - 1] [i] = 'Q';
				}
			    }
			    if (j < 9)
			    {
				if (my2DMap [j + 1] [i] == 'T')
				{
				    my2DMap [j + 1] [i] = 'Q';
				}
			    }
			    if (i > 0)
			    {
				if (my2DMap [j] [i - 1] == 'T')
				{
				    my2DMap [j] [i - 1] = 'Q';
				}
			    }
			    if (i < 9)
			    {
				if (my2DMap [j] [i + 1] == 'T')
				{
				    my2DMap [j] [i + 1] = 'Q';
				}
			    }
			}
		    }
		}

		for (int i = 0 ; i < 10 ; i++)
		{
		    for (int j = 0 ; j < 10 ; j++)
		    {
			if (my2DMap [j] [i] == 'Q')
			{
			    my2DMap [j] [i] = 'F';
			}
		    }
		}

		myCounter++;
	    }
	    out.println (myCounter);


	}
	in.close ();
	out.close ();
    }
}