from math import inf

def f(s):
    o, x = s.find('OOO'), s.find('XXX')

    o = inf if o == -1 else o
    x = inf if x == -1 else x
    
    if o < x:
        return "East"
    elif o > x:
        return "West"
    else:
        return "NA"

s = input()
print(f(s))