import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

S = read()

o = S.find(b'OOO')
x = S.find(b'XXX')

INF = 10 ** 9
if o == -1:
    o = INF
if x == -1:
    x = INF

if o < x:
    print('East')
elif x < o:
    print('West')
else:
    print('NA')