#include <bits/stdc++.h>
using namespace std;
bool ok1, ok2, ok3, ok4, p1, p2;
int n, m, maxx, minx, maxy, miny;
string a[4002];
int main() {
  cin >> n >> m;
  minx = miny = 1000000;
  maxx = maxy = -1000000;
  for (int i = 0; i < n; ++i) {
    cin >> a[i];
    for (int j = 0; j < m; ++j) {
      if (a[i][j] == 'w') {
        if (i > maxx) maxx = i;
        if (i < minx) minx = i;
        if (j > maxy) maxy = j;
        if (j < miny) miny = j;
      }
    }
  }
  if (maxx == -1000000) return cout << -1, 0;
  ok1 = ok2 = ok3 = ok4 = true;
  p1 = p2 = false;
  for (int j = 0; j < m; ++j) {
    if (a[maxx][j] == 'w' && j != maxy && j != miny) ok1 = false;
  }
  for (int j = 0; j < m; ++j) {
    if (a[minx][j] == 'w' && j != maxy && j != miny) ok2 = false;
  }
  if (minx == maxx && !ok1) {
    ok1 = ok2 = true;
    p1 = true;
  }
  for (int i = 0; i < n; ++i) {
    if (a[i][maxy] == 'w' && i != maxx && i != minx) ok3 = false;
  }
  for (int i = 0; i < n; ++i) {
    if (a[i][miny] == 'w' && i != maxx && i != minx) ok4 = false;
  }
  if (miny == maxy && !ok3) {
    ok3 = ok4 = true;
    p2 = true;
  }
  if (maxx - minx > maxy - miny) {
    if (ok3) {
      int oll = maxx - minx;
      int y = maxy;
      maxy = miny + oll;
      if (maxy >= m && !p2) {
        if (!ok4) return cout << -1, 0;
        while (maxy >= m) {
          maxy--;
          miny--;
        }
        if (miny < 0) return cout << -1, 0;
      } else if (maxy >= m) {
        miny = y - oll;
        maxy = y;
        if (miny < 0 || !ok4) return cout << -1, 0;
      }
    } else if (ok4) {
      miny = maxy - maxx + minx;
      if (miny < 0) return cout << -1, 0;
    } else
      return cout << -1, 0;
  } else if (maxx - minx < maxy - miny) {
    if (ok1) {
      int oll = maxy - miny;
      int x = maxx;
      maxx = minx + oll;
      if (maxx >= n && !p1) {
        if (!ok2) return cout << -1, 0;
        while (maxx >= n) {
          maxx--;
          minx--;
        }
        if (minx < 0) return cout << -1, 0;
      } else if (maxx >= n) {
        minx = x - oll;
        maxx = x;
        if (minx < 0 || !ok2) return cout << -1, 0;
      }
    } else if (ok2) {
      minx = maxx - maxy + miny;
      if (minx < 0) return cout << -1, 0;
    } else
      return cout << -1, 0;
  }
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < m; ++j) {
      if (a[i][j] == 'w' && i != minx && i != maxx && j != miny && j != maxy)
        return cout << -1, 0;
    }
  }
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < m; ++j) {
      if (a[i][j] == 'w')
        cout << 'w';
      else if (((i == minx || i == maxx) && (miny <= j && j <= maxy)) ||
               ((j == miny || j == maxy) && (minx <= i && i <= maxx)))
        cout << '+';
      else
        cout << '.';
    }
    cout << endl;
  }
}
