What is the watercraft on the dock that looks gray?
The watercraft is a boat.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of   19
2     6  to the right of   10
3     6   to the left of   17
4     6   to the left of   15
5     7  to the right of   14
6     8  to the right of   13
7     8  to the right of   18
8     8  to the right of   22
9     9  to the right of   18
10    9  to the right of   22
11    9  to the right of   13
12   10   to the left of   17
13   10   to the left of   11
14   10   to the left of    6
15   11   to the left of   17
16   11   to the left of   15
17   11  to the right of   10
18   13   to the left of    9
19   13  to the right of   16
20   13  to the right of    0
21   13   to the left of    8
22   13   to the left of   21
23   13   to the left of   20
24   14   to the left of    7
25   15  to the right of   17
26   15  to the right of   11
27   15  to the right of    6
28   16   to the left of   19
29   16   to the left of   13
30   17  to the right of   11
31   17  to the right of   10
32   17  to the right of    6
33   17   to the left of   15
34   18  to the right of   22
35   18   to the left of    8
36   18   to the left of    9
37   18   to the left of   20
38   18   to the left of   21
39   18               on   13
40   19  to the right of    0
41   19  to the right of   16
42   19   to the left of   22
43   20  to the right of   13
44   20  to the right of   18
45   20  to the right of   22
46   21  to the right of   13
47   21  to the right of   18
48   21  to the right of   22
49   22   to the left of   21
50   22   to the left of   20
51   22   to the left of   18
52   22  to the right of   19
53   22   to the left of    8
54   22   to the left of    9