s = input()
i,j = None, None
if 'OOO' in s:
    i=s.index('OOO')
if 'XXX' in s:
    j = s.index('XXX')

if (i is None) and (j is None):
    print('NA')
elif (i is None) and j!=None:
    print('West')
elif i!=None and (j is None):
    print('East')
else:
    if i<j:
        print('East')
    else:
        print('West')