#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define READ_BUFSIZE ( 128 )
#define READ_DELIMITER ( " " )


//標準入力取得（１行）

int GetStdin( char* pszStr, int lMaxLen )
{
	int lLen = 0;

    memset( pszStr, 0, lMaxLen );
    if( fgets( pszStr, lMaxLen, stdin ) )
    {
	    lLen = strlen( pszStr );
	    if( lLen >= 1 )
	    {
			if( pszStr[ lLen - 1 ] == 0x0A )
			{
				pszStr[ lLen - 1 ] = 0;
				lLen--;
			}
		}
	}
	
	return( lLen );
}



int main(int argc, char *argv[]) 
{
	char szRead[READ_BUFSIZE] = "";
	//char* psOutbuf[10000] = { 0 };
	//int lInput[10] = {0};

	int lLen = GetStdin( szRead, READ_BUFSIZE );


	char* pEast = strstr( szRead, "OOO" );

	char* pWast = strstr( szRead, "XXX" );

	if( pEast == 0 )
	{
		if( pWast == 0 )
			printf( "NA" );
		else
			printf( "West" );
	}
	else
	{
		if( pWast == 0 )
			printf( "East" );
		if( pEast > pWast )
			printf( "West" );
		else
			printf( "East" );
	}







	return 0;

}