What is the color of the cat that is to the left of the other cats?
The cat is gray.
    src        edge_attr  dst
0     0  to the right of    1
1     1  to the right of    5
2     1  to the right of    8
3     1               in    3
4     1  to the right of    9
5     1   to the left of    0
6     1   to the left of    6
7     1  to the right of   12
8     1  to the right of   11
9     1  to the right of   15
10    1  to the right of    4
11    3  to the right of   15
12    3  to the right of   10
13    4   to the left of    1
14    4   to the left of   12
15    5  to the right of   15
16    5   to the left of    1
17    6  to the right of    1
18    7  to the right of   11
19    7  to the right of    9
20    7  to the right of    8
21    7  to the right of   15
22    8               in    3
23    8  to the right of   10
24    8  to the right of   15
25    8   to the left of    1
26    8   to the left of    7
27    9   to the left of    7
28    9  to the right of   15
29    9   to the left of    1
30   10   to the left of    3
31   10   to the left of    8
32   11   to the left of    1
33   11   to the left of    7
34   11  to the right of   15
35   12  to the right of    4
36   12  to the right of   15
37   12   to the left of    1
38   14  to the right of   15
39   15   to the left of   14
40   15   to the left of    9
41   15   to the left of    5
42   15   to the left of    3
43   15   to the left of    1
44   15   to the left of   11
45   15   to the left of    8
46   15   to the left of    7
47   15   to the left of   12