S = input()
idx_E = idx_W = len(S)

if "OOO" in S:
    idx_E = S.index("OOO")
if "XXX" in S:
    idx_W = S.index("XXX")

if idx_E < idx_W:
    print("East")
elif idx_E == idx_W:
    print("NA")
else:
    print("West")