#include <bits/stdc++.h>

class DisjointSet {
 public:
  DisjointSet(int size) : parent_(size), size_(size, 1) {
    for (int i = 0; i < size; ++i) {
      parent_[i] = i;
    }
  }
  int Find(int x) {
    int& p = parent_[x];
    if (p != x) p = Find(p);
    return p;
  }
  void Union(int x, int y) {
    x = Find(x), y = Find(y);
    if (x == y) return;
    if (Size(x) > Size(y)) std::swap(x, y);
    parent_[x] = parent_[y];
    size_[y] += size_[x];
  }
  int Size(int x) { return size_[Find(x)]; }
  bool Same(int x, int y) { return Find(x) == Find(y); }

 private:
  std::vector<int> parent_, size_;
};
#include <boost/hana/functional/fix.hpp>

template <typename T, typename = void>
struct is_dereferenceable : std::false_type {};
template <typename T>
struct is_dereferenceable<T, std::void_t<decltype(*std::declval<T>())>>
    : std::true_type {};

template <typename T, typename = void>
struct is_iterable : std::false_type {};
template <typename T>
struct is_iterable<T, std::void_t<decltype(std::begin(std::declval<T>())),
                                  decltype(std::end(std::declval<T>()))>>
    : std::true_type {};

template <typename T, typename = void>
struct is_applicable : std::false_type {};
template <typename T>
struct is_applicable<T, std::void_t<decltype(std::tuple_size<T>::value)>>
    : std::true_type {};

template <typename T, typename... Ts>
void debug(const T& value, const Ts&... args);
template <typename T>
void debug(const T& v) {
  if constexpr (is_dereferenceable<T>::value) {
    std::cerr << "{";
    if (v) {
      debug(*v);
    } else {
      std::cerr << "nil";
    }
    std::cerr << "}";
  } else if constexpr (is_iterable<T>::value &&
                       !std::is_same<T, std::string>::value) {
    std::cerr << "{";
    for (auto it = std::begin(v); it != std::end(v); ++it) {
      if (it != std::begin(v)) std::cerr << ", ";
      debug(*it);
    }
    std::cerr << "}";
  } else if constexpr (is_applicable<T>::value) {
    std::cerr << "{";
    std::apply([](const auto&... args) { debug(args...); }, v);
    std::cerr << "}";
  } else {
    std::cerr << v;
  }
}
template <typename T, typename... Ts>
void debug(const T& value, const Ts&... args) {
  debug(value);
  std::cerr << ", ";
  debug(args...);
}
#if DEBUG
#define dbg(...)                        \
  do {                                  \
    cerr << #__VA_ARGS__ << ": ";       \
    debug(__VA_ARGS__);                 \
    cerr << " (L" << __LINE__ << ")\n"; \
  } while (0)
#else
#define dbg(...)
#endif

void read_from_cin() {}
template <typename T, typename... Ts>
void read_from_cin(T& value, Ts&... args) {
  std::cin >> value;
  read_from_cin(args...);
}
#define rd(type, ...) \
  type __VA_ARGS__;   \
  read_from_cin(__VA_ARGS__);
#define ints(...) rd(int, __VA_ARGS__);
#define strings(...) rd(string, __VA_ARGS__);

template <typename T>
void write_to_cout(const T& value) {
  if constexpr (std::is_same<T, bool>::value) {
    std::cout << (value ? "Yes" : "No");
  } else if constexpr (is_iterable<T>::value &&
                       !std::is_same<T, std::string>::value) {
    for (auto it = std::begin(value); it != std::end(value); ++it) {
      if (it != std::begin(value)) std::cout << " ";
      std::cout << *it;
    }
  } else {
    std::cout << value;
  }
}
template <typename T, typename... Ts>
void write_to_cout(const T& value, const Ts&... args) {
  write_to_cout(value);
  std::cout << ' ';
  write_to_cout(args...);
}
#define wt(...)                 \
  do {                          \
    write_to_cout(__VA_ARGS__); \
    cout << '\n';               \
  } while (0)

#define all(x) (x).begin(), (x).end()
#define eb(...) emplace_back(__VA_ARGS__)
#define pb(...) push_back(__VA_ARGS__)

#define dispatch(_1, _2, _3, name, ...) name

#define as_i64(x)                                                          \
  (                                                                        \
      [] {                                                                 \
        static_assert(                                                     \
            std::is_integral<                                              \
                typename std::remove_reference<decltype(x)>::type>::value, \
            "rep macro supports std integral types only");                 \
      },                                                                   \
      static_cast<std::int64_t>(x))

#define rep3(i, a, b) for (std::int64_t i = as_i64(a); i < as_i64(b); ++i)
#define rep2(i, n) rep3(i, 0, n)
#define rep1(n) rep2(_loop_variable_, n)
#define rep(...) dispatch(__VA_ARGS__, rep3, rep2, rep1)(__VA_ARGS__)

#define rrep3(i, a, b) for (std::int64_t i = as_i64(b) - 1; i >= as_i64(a); --i)
#define rrep2(i, n) rrep3(i, 0, n)
#define rrep1(n) rrep2(_loop_variable_, n)
#define rrep(...) dispatch(__VA_ARGS__, rrep3, rrep2, rrep1)(__VA_ARGS__)

#define each3(k, v, c) for (auto&& [k, v] : c)
#define each2(e, c) for (auto&& e : c)
#define each(...) dispatch(__VA_ARGS__, each3, each2)(__VA_ARGS__)

template <typename T>
std::istream& operator>>(std::istream& is, std::vector<T>& v) {
  for (T& vi : v) is >> vi;
  return is;
}

template <typename T, typename U>
std::istream& operator>>(std::istream& is, std::pair<T, U>& p) {
  is >> p.first >> p.second;
  return is;
}

template <typename T, typename U>
bool chmax(T& a, U b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}

template <typename T, typename U>
bool chmin(T& a, U b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}

template <typename T, typename U>
auto max(T a, U b) {
  return a > b ? a : b;
}

template <typename T, typename U>
auto min(T a, U b) {
  return a < b ? a : b;
}

template <typename T>
std::int64_t sz(const T& v) {
  return std::size(v);
}

template <typename T>
std::int64_t popcount(T i) {
  return std::bitset<std::numeric_limits<T>::digits>(i).count();
}

template <typename T>
bool hasbit(T s, int i) {
  return std::bitset<std::numeric_limits<T>::digits>(s)[i];
}

template <typename T, typename U>
auto div_floor(T n, U d) {
  if (d < 0) {
    n = -n;
    d = -d;
  }
  if (n < 0) {
    return -((-n + d - 1) / d);
  }
  return n / d;
};

template <typename T, typename U>
auto div_ceil(T n, U d) {
  if (d < 0) {
    n = -n;
    d = -d;
  }
  if (n < 0) {
    return -(-n / d);
  }
  return (n + d - 1) / d;
}

template <typename T>
bool even(T x) {
  return x % 2 == 0;
}

const std::int64_t big = std::numeric_limits<std::int64_t>::max() / 4;

using i64 = std::int64_t;
using i32 = std::int32_t;

template <typename T>
using low_priority_queue =
    std::priority_queue<T, std::vector<T>, std::greater<T>>;

template <typename T>
using V = std::vector<T>;
template <typename T>
using VV = V<V<T>>;

void Main();

int main() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(NULL);
  std::cout << std::fixed << std::setprecision(20);
  Main();
  return 0;
}

const auto& Fix = boost::hana::fix;

using namespace std;

#define int i64

pair<bool, V<string>> Solve(int h, int w, int x) {
  if (!even(x)) return {false, {}};
  V<string> g(h, string(w, '#'));
  rep(i, h) rep(j, w) if (even(i) && even(j)) g[i][j] = '.';
  rep(i, h) g[i][0] = '+';
  // rep(i, w) g[0][i] = '.';
  for (int c = 1; c < w; c += 4) g[h - 1][c] = '+';
  g[h - 1][w - 1] = '+';
  x -= (h - 1) + (w - 1);
  if (x < 0) return {false, {}};
  rep(i, (w - 1) / 4) {
    int d = x / 4;
    int y = (h - 1) / 2;
    int z = min(d, y);
    dbg(x, z);
    int c = i * 4 + 2;
    int r = h - 1;
    dbg(d, y, z, c, r);
    g[r][c] = '+';
    rep(j, z) {
      rep(2) {
        --r;
        g[r][c] = '+';
      }
    }
    /*
    if (r > 0) {
      int r2 = r - 2;
      int c2 = c;
      while (r2 >= 0) {
        g[r2][c2] = '.';
        --r2;
      }
      ++r2;
      g[r2][c2 - 1] = '.';
      g[r2][c2 + 1] = '.';
      while (r2 <= r - 2) {
        g[r2][c2 + 1] = '.';
        ++r2;
      }
    }
    */
    rep(2) {
      ++c;
      g[r][c] = '+';
    }
    rep(j, z) {
      rep(2) {
        ++r;
        g[r][c] = '+';
      }
    }
    x -= z * 4;

    // rep(r, h) dbg(i, g[r]);
  }
  // int cnt = 0;
  DisjointSet ds(h * w);
  auto idx = [&](int i, int j) { return i * w + j; };
  int di[] = {0, 1, 0, -1};
  int dj[] = {1, 0, -1, 0};
  rep(i, h) rep(j, w) {
    if (g[i][j] != '+') continue;
    rep(d, 4) {
      int ni = i + di[d];
      int nj = j + dj[d];
      if (0 <= ni && ni < h && 0 <= nj && nj < w) {
        if (g[ni][nj] != '+') continue;
        ds.Union(idx(i, j), idx(ni, nj));
      }
    }
  }
  rep(i, h) rep(j, w) {
    if (g[i][j] == '.') {
      rep(d, 4) {
        int ni = i + di[d] * 2;
        int nj = j + dj[d] * 2;
        if (0 <= ni && ni < h && 0 <= nj && nj < w) {
          if (g[ni][nj] != '#') {
            if (ds.Same(idx(i, j), idx(ni, nj))) continue;
            ds.Union(idx(i, j), idx(ni, nj));
            g[i + di[d]][j + dj[d]] = 'o';
          }
          /*
          if ((ni == 0 && nj == 0) || (ni == h - 1 && nj == w - 1)) {
            if (ds.Same(idx(i, j), idx(ni, nj))) continue;
            ds.Union(idx(i, j), idx(ni, nj));
            g[i + di[d]][j + dj[d]] = '!';
          }
          */
        }
      }
    }
  }
  rep(i, h) rep(j, w) {
    if (even(i) && even(j)) assert(g[i][j] != '#');
    if (!even(i) && !even(j)) assert(g[i][j] == '#');
  }
  if (x == 0) {
    rep(i, h) dbg(g[i]);
  }
  rep(i, h) rep(j, w) if (g[i][j] != '#') g[i][j] = '.';
  return {x == 0, g};
}

void Main() {
  ints(h, w, x);
  if (auto [ok, g] = Solve(h, w, x); ok) {
    each(e, g) wt(e);
    return;
  }
  if (auto [ok, g] = Solve(w, h, x); ok) {
    rep(i, h) {
      rep(j, w) cout << g[j][i];
      cout << endl;
    }
    return;
  }
  wt(-1);
}