#include <bits/stdc++.h>
#include <cassert>
typedef long long int ll;
using namespace std;

// @@ !! LIM(board)
// --> board
// ---- inserted library file board.cc

struct BrdIdx {
  int r;
  int c;
  BrdIdx(int r_, int c_) : r(r_), c(c_) {}
  BrdIdx() : r(0), c(0) {}

  BrdIdx& operator +=(const BrdIdx& o) { r += o.r; c += o.c; return *this; }
  BrdIdx& operator -=(const BrdIdx& o) { r -= o.r; c -= o.c; return *this; }
  BrdIdx& operator *=(int k) { r *= k; c *= k; return *this; }
  BrdIdx operator +(const BrdIdx& o) const { return BrdIdx(*this) += o; }
  BrdIdx operator -(const BrdIdx& o) const { return BrdIdx(*this) -= o; }
  BrdIdx operator *(int k) const { return BrdIdx(*this) *= k; }
  BrdIdx operator -() const { return (*this) * (-1); }

  bool operator ==(const BrdIdx& o) const { return r == o.r && c == o.c; }
  bool operator !=(const BrdIdx& o) const { return !((*this) == o); }
  bool operator <(const BrdIdx& o) const {
    return r < o.r || (r == o.r && c < o.c); }
  bool operator <=(const BrdIdx& o) const {
    return r < o.r || (r == o.r && c <= o.c); }
  bool operator >(const BrdIdx& o) const { return o < *this; }
  bool operator >=(const BrdIdx& o) const { return o <= *this; }

  BrdIdx rotateQ() { return BrdIdx(-c, r); } // counter-clockwise

  static vector<BrdIdx> nbr4, nbr5, nbr8, nbr9;
};

vector<BrdIdx>
  BrdIdx::nbr4({      {1,0},      {0,1},       {-1,0},        {0,-1}       }),
  BrdIdx::nbr5({{0,0},{1,0},      {0,1},       {-1,0},        {0,-1}       }),
  BrdIdx::nbr8({      {1,0},{1,1},{0,1},{-1,1},{-1,0},{-1,-1},{0,-1},{1,-1}}),
  BrdIdx::nbr9({{0,0},{1,0},{1,1},{0,1},{-1,1},{-1,0},{-1,-1},{0,-1},{1,-1}});

BrdIdx operator *(int k, const BrdIdx& o) { return o * k; }
ostream& operator <<(ostream& os, const BrdIdx& i) {
  os << "(" << i.r << "," << i.c << ")";
  return os;
}

template <typename T>
struct Board {

  void readData(istream& is) {
    for (int i = 0; i < nR; i++) {
      for (int j = 0; j < nC; j++) {
	T t; is >> t;
	set(i, j, t);
      }
    }
  }

  const int nR;
  const int nC;
  const T def;
  vector<T> data;
  int dispWidth;

  Board(int nR_, int nC_, T def_)
    : nR(nR_), nC(nC_), def(def_), data(nR*nC, def), dispWidth(0) {}
  Board(istream& is, int nR_, int nC_, T def_)
    : nR(nR_), nC(nC_), def(def_), data(nR*nC, def), dispWidth(0) {
    readData(is);
  }
  BrdIdx bIdx(int r = 0, int c = 0) { return BrdIdx(r, c); }
  int enc(int r, int c) const { return nC * r + c; }
  int enc(const BrdIdx& bi) const { return nC * bi.r + bi.c; }
  pair<int, int> dec(int i) const { return make_pair(i / nC, i % nC); }
  BrdIdx decIdx(int i) const { return BrdIdx(i / nC, i % nC); }
  bool in(int r, int c) const { return 0 <= r && r < nR && 0 <= c && c < nC; }
  bool in(const BrdIdx& bi) const { return in(bi.r, bi.c); }
  const T get(int r, int c) const {
    return in(r, c) ? data.at(enc(r, c)) : def;
  }
  const T get(const BrdIdx& bi) const { return get(bi.r, bi.c); }
  // Note: returning a reference (const T& get(...)) is problematic
  //       when T is bool.  (vector<bool> is implemented in a specific way)
  void set(int r, int c, T t) { if (in(r, c)) data.at(enc(r, c)) = t; }
  void set(const BrdIdx& bi, T t) { set(bi.r, bi.c, t); }
  void setDispWidth(int w) { dispWidth = w; }
};

template<typename T>
ostream& operator <<(ostream& os, const Board<T>& brd) {
  for (int r = 0; r < brd.nR; r++) {
    for (int c = 0; c < brd.nC; c++) {
      os << setw(brd.dispWidth) << brd.get(r, c);
    }
    if (r < brd.nR - 1) os << "\n";
  }
  return os;
}

// ---- end board.cc
// @@ !! LIM  -- end mark --

int main(int argc, char *argv[]) {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout << setprecision(20);

  ll H, W, K; cin >> H >> W >> K;
  BrdIdx start, goal;
  {
    ll x1, y1, x2, y2; cin >> x1 >> y1 >> x2 >> y2;
    x1--; y1--; x2--; y2--;
    start = BrdIdx(x1, y1);
    goal = BrdIdx(x2, y2);
  }
  Board<char> brd(cin, H, W, '@');
  Board<char> visited(H, W, 0);
  using StA = tuple<BrdIdx, BrdIdx, ll>;
  queue<StA> que;
  for (BrdIdx dir : BrdIdx::nbr4) que.emplace(start, dir, 0);
  visited.set(start, 1);
  while (!que.empty()) {
    auto [cur, dir, dist] = que.front(); que.pop();
    for (ll i = 1; i <= K; i++) {
      BrdIdx bi = cur + i * dir;
      if (bi == goal) {
	cout << dist + 1 << endl;
	return 0;
      }
      if (brd.get(bi) == '@') break;
      if (visited.get(bi) == 1) continue;
      visited.set(bi, 1);
      if (i == K) que.emplace(bi, dir, dist + 1);
      que.emplace(bi, BrdIdx(-dir.c, dir.r), dist + 1);
      que.emplace(bi, BrdIdx(dir.c, -dir.r), dist + 1);
    }
  }
  cout << "-1\n";

  return 0;
}



Measured memory_bytes: 11120