S = list(input())
for i in range(len(S)-2):
    if S[i]==S[i+1]==S[i+2]:
        if S[i]=='O':
            win = 'East'
        elif S[i]=='X':
            win = 'West'
        break
try:
    win
except NameError:
    win = 'NA'
print(win)