import sys

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

def solve():
    S = input()
    N = len(S)

    cnt_o = 0
    cnt_x = 0

    for c in S:
        if c == 'O':
            cnt_x = 0
            cnt_o += 1
            if cnt_o >= 3:
                print('East')
                return None
        else:
            cnt_o = 0
            cnt_x += 1
            if cnt_x >= 3:
                print('West')
                return None

    print('NA')


if __name__ == '__main__':
    solve()