public bool IsPressed(Input input)
{
bool extraKeys = isStrg == input.IsStrg && isAlt == input.IsAlt && isShift == input.IsShift;
bool keysOK = false;
foreach(Keys key in keys)
{
if (!input.IsKeyDown(key)) { keysOK = false; break; }
if (input.IsKeyPressed(key)) keysOK = true;
}
return extraKeys && keysOK;
}
