battles = input()
winner = "NA"
if len(battles) >= 3:
    straight = 0
    win_mark = ""
    final_decision = False
    for battle in battles:
        if not final_decision:
            if win_mark != battle:
                win_mark = battle
                straight = 1
            else:
                straight+=1
                if straight >= 3:
                    final_decision = True
                    break
    if final_decision:
        winner = "West" if win_mark == "X" else "East"
print(winner)