//No.486 3 Straight Win(3連勝)


#include <bits/stdc++.h>
using namespace std;

int main()
{
int i;
int iE;
int iW;
char S[ 110 ];
char C;

	cin >> S;

	iE = 0;
	iW = 0;

	i = 0;
	C = S[ i ];
	while( C != '\0' )
	{
		if( C == 'O' )
		{
			iE++;
			iW = 0;
			if( iE >= 3 )
			{
				cout << "East" << endl;

				return 0;
			}
		}
		else if( C == 'X' )
		{
			iE = 0;
			iW++;
			if( iW >= 3 )
			{
				cout << "West" << endl;

				return 0;
			}
		}

		i++;
		C = S[ i ];
	}

	cout << "NA" << endl;

	return 0;
}