using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;

class Program
{
    static void Main()
    {
        var RCT = ReadLine().Split().Select(int.Parse).ToArray();
        var Syx = ReadLine().Split().Select(int.Parse).ToArray();
        var Gyx = ReadLine().Split().Select(int.Parse).ToArray();
        var R = RCT[0];
        var C = RCT[1];
        var T = RCT[2];
        var Sy = Syx[0];
        var Sx = Syx[1];
        var Gy = Gyx[0];
        var Gx = Gyx[1];
        var map = new bool[R, C];
        for (int i = 0; i < R; i++)
        {
            var line = ReadLine();
            for (int j = 0; j < C; j++)
            {
                map[i, j] = line[j] == '.';
            }
        }

        var d = new int[R, C];
        for (int i = 1; i < R - 1; i++)
        {
            for (int j = 1; j < C - 1; j++)
            {
                if (map[i + 1, j]) d[i, j]++;
                if (map[i, j + 1]) d[i, j]++;
                if (map[i - 1, j]) d[i, j]++;
                if (map[i, j - 1]) d[i, j]++;
            }
        }
        if (d[Sy, Sx] == 0)
        {
            WriteLine(1);
            return;
        }
        var dp = new double[R, C, 100000];
        dp[Sy, Sx, 0] = 1;
        for (int k = 1; k < 100000; k++)
        {
            for (int i = 1; i < R - 1; i++)
            {
                for (int j = 1; j < C - 1; j++)
                {
                    dp[i, j, k] = (map[i + 1, j] ? dp[i + 1, j, k - 1] / d[i + 1, j] : 0) + (map[i - 1, j] ? dp[i - 1, j, k - 1] / d[i - 1, j] : 0) + (map[i, j + 1] ? dp[i, j + 1, k - 1] / d[i, j + 1] : 0) + (map[i, j - 1] ? dp[i, j - 1, k - 1] / d[i, j - 1] : 0);
                }
            }
        }
        if (T < 100000) WriteLine(dp[Gy, Gx, T]);
        else WriteLine(T % 2 == 0 ? dp[Gy, Gx, 99998] : dp[Gy, Gx, 99999]);
    }
}