S = str(input())

cO, cX = 0, 0
for s in S:
    if s == 'O':
        cO, cX = cO + 1, 0
        if (cO == 3):
            print('East')
            break
    else:
        cO, cX = 0, cX + 1
        if (cX == 3):
            print('West')
            break
else:
    print('NA')