#include <bits/stdc++.h>
using namespace std;
int i, j, k, n, m, K, g, r;
int a[10];
char p[110];
inline void into(int x) {
  int i;
  for (i = 0; i <= 9; i++) a[i] += x >> i & 1;
}
int main() {
  scanf("%d%d%d", &n, &m, &K);
  for (i = 1; i <= n; i++) {
    scanf("%s", p + 1);
    int gg, rr, A, B;
    gg = rr = A = B = 0;
    for (j = 1; j <= m; j++) {
      gg |= p[j] == 'G';
      rr |= p[j] == 'R';
      if (p[j] != '-') {
        if (!A)
          A = j;
        else
          B = j;
      }
    }
    if (!B && m > 1) g |= gg, r |= rr;
    if (B && m > 2 && (!gg || !rr)) g |= gg, r |= rr;
    if (B && gg && rr) into(B - A - 1);
  }
  if (g && r)
    printf("Draw\n");
  else if (g)
    printf("First\n");
  else if (r)
    printf("Second\n");
  else {
    for (i = 0; i <= 9; i++)
      if (a[i] % (K + 1)) {
        printf("First\n");
        break;
      }
    if (i == 10) printf("Second\n");
  }
  return 0;
}
