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')