S = input()
EAST = S.find("OOO")
WEST = S.find("XXX")
if EAST == -1 and WEST == -1:
    print("NA")
elif EAST == -1:
    print("West")
elif WEST == -1:
    print("East")
elif EAST < WEST:
    print("East")
else:
    print("West")