s=input()
c_e=0
c_w=0
for i in range(len(s)-2):
    if s[i]=='O' and s[i+1]=='O' and s[i+2]=='O':
        c_e+=1
        break
    elif s[i]!='O' and s[i+1]!='O' and s[i+2]!='O':
        c_w+=1
        break
if c_e==1:
    print('East')
elif c_w==1:
    print('West')
else:
    print('NA')