A cuboid iron block with a length of 8 decimeters, a width of 2 decimeters and a height of 4 decimeters is forged into a cube. What is the length of the sides of the cube in decimeters?
把一块长8分米、宽2分米、高4分米的长方体铁块锻造成一块正方体，求正方体的棱长是多少分米？
<result>4</result>