/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author majk
 */

#ifndef MAJK_LIB
#define MAJK_LIB

#include <vector>
#include <stack>
#include <iostream>
#include <unordered_map>
#include <unordered_set>
#include <map>
#include <iomanip>
#include <set>
#include <functional>
#include <algorithm>
#include <numeric>
#include <cassert>
#include <cmath>
#include <string>
#include <queue>
#include <array>
#include <bitset>
using namespace std;

#define x first
#define y second
typedef std::pair<int,int> pii; typedef long long ll; typedef unsigned long long ull; typedef unsigned int ui; typedef pair<ui,ui> puu;

template <typename T, typename U> std::istream&operator>>(std::istream&i, pair<T,U>&p) {i >> p.x >> p.y; return i;}
template<typename T>std::istream&operator>>(std::istream&i,vector<T>&t) {for(auto&v:t){i>>v;}return i;}
template <typename T, typename U> std::ostream&operator<<(std::ostream&o, const pair<T,U>&p) {o << p.x << ' ' << p.y; return o;}
template<typename T>std::ostream&operator<<(std::ostream&o,const vector<T>&t) {if(t.empty())o<<'\n';for(size_t i=0;i<t.size();++i){o<<t[i]<<" \n"[i == t.size()-1];}return o;}
template<typename T> using minheap = priority_queue<T, vector<T>, greater<T>>;
template<typename T> using maxheap = priority_queue<T, vector<T>, less<T>>;
ui logceil(ll x) { return x?8*sizeof(ll)-__builtin_clzll(x):0; }

namespace std { template<typename T,typename U>struct hash<pair<T,U>>{hash<T>t;hash<U>u;size_t operator()(const pair<T,U>&p)const{return t(p.x)^(u(p.y)<<7);}}; }
template<typename T,typename F>T bsh(T l,T h,const F&f){T r=-1,m;while(l<=h){m=(l+h)/2;if(f(m)){l=m+1;r=m;}else{h=m-1;}}return r;}
template<typename F> double bshd(double l,double h,const F&f,double p=1e-9){ui r=3+(ui)log2((h-l)/p);while(r--){double m=(l+h)/2;if(f(m)){l=m;}else{h=m;}}return (l+h)/2;}
template<typename T,typename F>T bsl(T l,T h,const F&f){T r=-1,m;while(l<=h){m=(l+h)/2;if(f(m)){h=m-1;r=m;}else{l=m+1;}}return r;}
template<typename F> double bsld(double l,double h,const F&f,double p=1e-9){ui r=3+(ui)log2((h-l)/p);while(r--){double m=(l+h)/2;if(f(m)){h=m;}else{l=m;}}return (l+h)/2;}
template<typename T> T gcd(T a,T b) { if (a<b) swap(a,b); return b?gcd(b,a%b):a; }


template<typename T>class vector2:public vector<vector<T>>{public:vector2(){} vector2(size_t a,size_t b,T t=T()):vector<vector<T>>(a,vector<T>(b,t)){}};
template<typename T>class vector3:public vector<vector2<T>>{public:vector3(){} vector3(size_t a,size_t b,size_t c,T t=T()):vector<vector2<T>>(a,vector2<T>(b,c,t)){}};
template<typename T>class vector4:public vector<vector3<T>>{public:vector4(){} vector4(size_t a,size_t b,size_t c,size_t d,T t=T()):vector<vector3<T>>(a,vector3<T>(b,c,d,t)){}};
template<typename T>class vector5:public vector<vector4<T>>{public:vector5(){} vector5(size_t a,size_t b,size_t c,size_t d,size_t e,T t=T()):vector<vector4<T>>(a,vector4<T>(b,c,d,e,t)){}};


#endif

class FPondSkater {
public:
    void solve(istream& cin, ostream& cout) {
        int H, W, K; cin >> H >> W >> K;
        int X1, Y1, X2, Y2; cin >> X1 >> Y1 >> X2 >> Y2;
        vector<string> A(H); cin >> A;

        X1--; X2--; Y1--; Y2--;
        vector<pii> Q{{X1,Y1}};
        vector3<bool> U(4, H, W, false);
        vector2<int> D(H,W,10000000);
        D[X1][Y1] = 0;
        vector<pii> Dir{{1,0}, {0,1},{-1,0},{0,-1}};
        while (!Q.empty()) {
            vector<pii> P;

            for (int d = 0; d < 4; ++d) {
                if (d == 0) {
                    sort(Q.begin(),Q.end(),[](const pii&a, const pii&b) { return a.x > b.x; });
                } else if (d == 1) {
                    sort(Q.begin(),Q.end(),[](const pii&a, const pii&b) { return a.y > b.y; });
                } else if (d == 2) {
                    sort(Q.begin(),Q.end(),[](const pii&a, const pii&b) { return a.x < b.x; });
                } else if (d == 3) {
                    sort(Q.begin(),Q.end(),[](const pii&a, const pii&b) { return a.y < b.y; });
                }
                for (int i = 0; i < Q.size(); ++i) {
                    pii q = Q[i];
                    for (int j = 1; j <= K; ++j) {
                        int x = q.x + j * Dir[d].x;
                        int y = q.y + j * Dir[d].y;
                        if (x < 0 || x >= H || y < 0 || y >= W) break;
                        if (A[x][y] == '@') break;
                        if (U[d][x][y]) break;
                        U[d][x][y] = true;
                        if (D[x][y] > D[q.x][q.y] + 1) {
                            D[x][y] = D[q.x][q.y] + 1;
                            P.push_back({x, y});
                        }
                    }
                }
            }
            swap(P, Q);
        }
        cout << (D[X2][Y2] == 10000000 ? -1 :(D[X2][Y2])) << '\n';
    }
};


int main() {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
	FPondSkater solver;
	std::istream& in(std::cin);
	std::ostream& out(std::cout);
	solver.solve(in, out);
    return 0;
}


Measured memory_bytes: 12684