#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:1024000000,1024000000")
using namespace std;
const int inf = 0x3f3f3f3f;
const long long INF = 1e18;
template <typename T>
void read(T &x) {
  x = 0;
  int s = 1, c = getchar();
  for (; !isdigit(c); c = getchar())
    if (c == '-') s = -1;
  for (; isdigit(c); c = getchar()) x = x * 10 + c - 48;
  x *= s;
}
template <typename T>
void write(T x) {
  if (x < 0) x = -x, putchar('-');
  if (x > 9) write(x / 10);
  putchar(x % 10 + '0');
}
template <typename T>
void writeln(T x) {
  write(x);
  puts("");
}
int n, m, k;
char s[105];
int ans, val[105];
bool flag1, flag2;
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> n >> m >> k;
  for (int i = 1; i <= n; i++) {
    cin >> s;
    val[i] = -1;
    int f1 = -1, f2 = -1, tmp = 0;
    for (int j = 0; j <= m - 1; j++)
      if (s[j] == 'G')
        f1 = j;
      else if (s[j] == 'R')
        f2 = j;
      else
        tmp++;
    if (tmp == 0 || tmp == m) continue;
    if (f1 >= 0 && f2 >= 0) {
      val[i] = abs(f2 - f1) - 1;
    } else if (f1 < 0) {
      flag2 = 1;
    } else
      flag1 = 1;
  }
  if (!flag1 && !flag2) {
    int tmp[10] = {0};
    for (int i = 1; i <= n; i++)
      if (val[i] > 0) {
        int cnt = 0;
        for (int j = val[i]; j; j >>= 1) tmp[cnt++] += j % 2;
      }
    for (int i = 0; i <= 9; i++)
      if (tmp[i] % (k + 1) != 0) {
        flag1 = 1;
      }
    cout << (flag1 ? "First\n" : "Second\n");
  } else if (flag1 && flag2) {
    cout << "Draw\n";
  } else
    cout << (flag1 ? "First\n" : "Second\n");
  return 0;
}
