S = input()
E = S.find('OOO')
W = S.find('XXX')

A = 'NA'
if (E == -1 and W != -1) or (0 <= W < E):
    A = 'West'
elif (W == -1 and E != -1) or (0 <= E < W):
    A = 'East'

print(A)