S=input()
count=0
counter=0
for x in S:
    if x[0]=='O':
        count+=1
        if count==3:
            print('East')
        
    else:
        count=0
        break
    if x[0]=='X':
        counter+=1
        if counter==3:
            print('West')
    else:
        counter=0
else:
    print('NA')