prog.cs(3,7): error CS0246: The type or namespace name `UnityEngine' could not be found. Are you missing an assembly reference?
prog.cs(4,7): error CS0246: The type or namespace name `UnityEngine' could not be found. Are you missing an assembly reference?
prog.cs(6,23): error CS0246: The type or namespace name `MonoBehaviour' could not be found. Are you missing an assembly reference?
prog.cs(8,12): error CS0246: The type or namespace name `Text' could not be found. Are you missing an assembly reference?
prog.cs(9,12): error CS0246: The type or namespace name `Ball' could not be found. Are you missing an assembly reference?
Compilation failed: 5 error(s), 0 warnings