if __name__ == '__main__':
    s = input()
    judge = 0
    east = 0
    west = 0
    i = 0


    while i < len(s):
        if s[i] == 'O':
            east += 1
            west = 0
        elif s[i] == 'X':
            east = 0
            west += 1
        if east == 3 or west == 3:
            judge = 1 if east == 3 else -1
            break
        i+=1
        
    if len(s) < 3:
        judge = 0

    if judge > 0:
        print('East')
    elif judge < 0:
        print('West')
    else:
        print('NA')