#include <cstdio>

int main() {
  int n;
  scanf("%d", &n);

  int no = 0;
  int yes = (1 << 10) - 1;
  for (int i = 0; i < n; ++i) {
    int cur = 0;
    for (int j = 0; j < 4; ++j) {
      int a;
      scanf("%d", &a);
      cur |= 1 << a;
    }

    char r[4];
    scanf("%s", r);
    if (r[0] == 'Y') {
      yes &= cur;
    } else {
      no |= cur;
    }
  }

  yes &= ~no;
  printf("%d\n", __builtin_ctz(yes));
}