#!/usr/bin/env python

def main():
    s = input().strip()
    e = s.find('OOO')
    w = s.find('XXX')
    if e == w:
        print('NA')
    elif e == -1:
        print('West')
    elif w == -1:
        print('East')
    elif e < w:
        print('East')
    elif w < e:
        print('West')

if __name__ == '__main__':
    main()