#include <string>
#include <vector>
#include <iostream>
using namespace std;

class NumberMagicEasy {
  public:
    int theNumber(string answer);
};

int NumberMagicEasy::theNumber(string answer)
{
  int i;
  int res;
  vector <int> c;

  c.push_back((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7) | (1 << 8));
  c.push_back((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 9) | (1 << 10) | (1 << 11) | (1 << 12));
  c.push_back((1 << 1) | (1 << 2) | (1 << 5) | (1 << 6) | (1 << 9) | (1 << 10) | (1 << 13) | (1 << 14));
  c.push_back((1 << 1) | (1 << 3) | (1 << 5) | (1 << 7) | (1 << 9) | (1 << 11) | (1 << 13) | (1 << 15));

  for (i = 0; i < 4; i++) if (answer[i] == 'N') c[i] = ~c[i];

  res = c[0] & c[1] & c[2] & c[3];

  for (i = 1; i <= 16; i++) if (res & (1 << i)) return i;

  return -1;  // This won't happen, but it shuts the compiler up and helps find bugs.
}