s=input()
win="NA"
if "OOO" in s and "XXX" in s:
    a=s.index("OOO")
    b=s.index("XXX")
    if a<b:
        win="East"
    else:
        win="West"
elif "OOO" in s:
    win="East"
elif "XXX" in s:
    win="West"
print(win)