#include <bits/stdc++.h>
using namespace std;
int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);
  long long n, m, k, counterfirst = 0, arr[100] = {};
  bool firstwithoutsecond = 0, secondwithoutfirst = 0;
  cin >> n >> m >> k;
  char c;
  for (int i = 0; i < n; i++) {
    long long first = -1, second = -1, counter1 = 0, counter2 = 0;
    for (int h = 0; h < m; h++) {
      cin >> c;
      if (c == 'G') {
        counter1++;
        first = h;
      }
      if (c == 'R') {
        counter2++;
        second = h;
      }
    }
    if (first == -1 && second != -1 && counter2 != m) {
      secondwithoutfirst = 1;
    }
    if (first != -1 && second == -1 && counter1 != m) {
      firstwithoutsecond = 1;
    }
    if (first != -1 && second != -1) {
      long long def = abs(first - second) - 1;
      for (long long h = 0; h < 60; h++) {
        if (def & 1LL << h) {
          arr[h]++;
        }
      }
    }
  }
  counterfirst = 0;
  for (int i = 0; i < 60; i++) {
    counterfirst += arr[i] % (k + 1);
  }
  if (secondwithoutfirst && firstwithoutsecond) {
    cout << "Draw" << endl;
  } else if (secondwithoutfirst && !firstwithoutsecond) {
    cout << "Second" << endl;
  } else if (!secondwithoutfirst && firstwithoutsecond) {
    cout << "First" << endl;
  } else if (counterfirst == 0)
    cout << "Second" << endl;
  else
    cout << "First" << endl;
  return 0;
}
