I. Shaxmat: ♞ Otning yurishi

Shaxmat taxtasida ot \((x_1, y_1)\) koordinatada turibdi. U \((x_2, y_2)\) koordinatadagi katakka bir yurishda bora oladimi yoki yo'qmi, aniqlang.

Ot shaxmatda "Г" shaklida yuradi: bir yo'nalishda \(2\) katak, unga perpendikulyar yo'nalishda \(1\) katak (ya'ni koordinatalar farqi (\(\vert{}x_1 - x_2\vert{}\), \(\vert{}y_1 - y_2\vert{}\)) juftligi \((1, 2)\) yoki \((2, 1)\) ga teng bo'lishi kerak).

Kiruvchi ma'lumotlar

Bitta qatorda to'rtta butun son \(x_1, y_1, x_2, y_2\) (\(1 \le x_1, y_1, x_2, y_2 \le 8\)) beriladi — mos ravishda otning boshlang'ich joylashuvi \((x_1, y_1)\) va borishi kerak bo'lgan joy \((x_2, y_2)\).

Chiquvchi ma'lumotlar

Agar ot bir yurishda \((x_1, y_1)\) dan \((x_2, y_2)\) ga bora olsa — YES, aks holda — NO chop eting.

Misollar

1

1 1 2 3

YES

2

1 1 3 3

NO