틱택토 - BOJ

틱택토 - BOJ

while True:
    s = list(input())
    if s[0] == 'e':
        break
    x, y, cx, cy = 0, 0, 0, 0
    for i in range(3):
        if (s[i * 3] == 'O' and s[i * 3 + 1] == 'O' and s[i * 3 + 2] == 'O') \
        or (s[i] == 'O' and s[i + 3] == 'O' and s[i + 6] == 'O') \
        or (s[0] == 'O' and s[4] == 'O' and s[8] == 'O') \
        or (s[2] == 'O' and s[4] == 'O' and s[6] == 'O'):
            x += 1
        elif (s[i * 3] == 'X' and s[i * 3 + 1] == 'X' and s[i * 3 + 2] == 'X') \
        or (s[i] == 'X' and s[i + 3] == 'X' and s[i + 6] == 'X') \
        or (s[0] == 'X' and s[4] == 'X' and s[8] == 'X') \
        or (s[2] == 'X' and s[4] == 'X' and s[6] == 'X'):
            y += 1
        for j in range(3):
            if s[i * 3 + j] == 'O':
                cx += 1
            if s[i * 3 + j] == 'X':
                cy += 1
    if cy - cx == 1 and y and x == 0:
        print("valid")
    elif cx == cy and x and y == 0:
        print("valid")
    elif cy == 5 and cx == 4 and y == 0 and x == 0:
        print("valid")
    else:
        print("invalid")