What is the color of the helmet of the skater?
The helmet is black.
    src        edge_attr  dst
0     0           behind   17
1     3   to the left of   14
2     3  to the right of   11
3     4   on the side of    2
4     4  to the right of   10
5     4  to the right of   17
6     4  to the right of    7
7     4  to the right of    5
8     4  to the right of   18
9     5   to the left of    4
10    7   to the left of   18
11    7   to the left of    4
12    7               of   17
13    8  to the right of   11
14    8  to the right of    9
15    8  to the right of   16
16    8               of   17
17    9   to the left of    8
18    9               of   17
19    9   to the left of   14
20    9  to the right of   11
21    9   to the left of   20
22   10   to the left of    4
23   10               of   17
24   11   to the left of   16
25   11   to the left of    9
26   11   to the left of   20
27   11   to the left of    3
28   11   to the left of    8
29   13               of   12
30   14  to the right of    3
31   14  to the right of    9
32   14               of   12
33   15               of   12
34   16   to the left of    8
35   16  to the right of   11
36   16   to the left of   20
37   17   to the left of    4
38   17          wearing   10
39   17      in front of    0
40   17          wearing    9
41   17     traveling on    2
42   17          wearing    8
43   17          wearing   18
44   18               of   17
45   18  to the right of    7
46   18   to the left of    4
47   19               of   12
48   20  to the right of   11
49   20  to the right of   16
50   20  to the right of    9