battles = input()
w = battles.find("OOO")
l = battles.find("XXX")
if w < l and w != -1:
    print("East")
elif w < l and w == -1:
    print("West")
elif w > l and l != -1:
    print("West")
elif w > l and l == -1:
    print("East")
else:print("NA")