def solve():
    s = input()
    for i, c in enumerate(s):
        if (i + 2 > len(s) - 1):
            break
        if (s[i] == 'O' and s[i + 1] == 'O' and s[i + 2] == 'O'):
            print('East')
            return
        if (s[i] == 'X' and s[i + 1] == 'X' and s[i + 2] == 'X'):
            print('West')
            return

    print("NA")


solve()