#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, k;
  scanf("%d%d%d", &n, &m, &k);
  bool ron = 0, gon = 0;
  string s;
  int sum[8] = {0};
  while (n--) {
    cin >> s;
    int r = -1, g = -1, d = -1;
    for (int i = 0; i < m; i++) {
      if (s[i] == 'R')
        r = i;
      else if (s[i] == 'G')
        g = i;
      else
        d = i;
    }
    if ((r == -1 && g == -1) || d == -1) continue;
    if (g == -1) {
      gon = 1;
      continue;
    }
    if (r == -1) {
      ron = 1;
      continue;
    }
    int tmp = abs(r - g) - 1;
    for (int i = 0; i < 8; i++) sum[i] += bool(tmp & (1 << i));
  }
  if (ron && gon)
    cout << "Draw\n";
  else if (ron)
    cout << "First\n";
  else if (gon)
    cout << "Second\n";
  else {
    bool sec = 1;
    for (int i = 0; i < 8; i++)
      if (sum[i] % (k + 1)) sec = 0;
    if (sec)
      cout << "Second\n";
    else
      cout << "First\n";
  }
  return 0;
}
