# coding: utf-8

def main():
    l = input()
    print(judge(l))

def judge(l):
    def _judge(l, n, p):
        if n == 3:
            return 'East' if p == 'O' else 'West'
        elif not l:
            return 'NA'
        else:
            return _judge(l[1:], n+1 if l[0] == p else 1, l[0])
    return _judge(l, 1, '')
        
if __name__ == '__main__':
    main()