Which kind of device is to the left of the computer monitor?
The device is a monitor.
    src        edge_attr  dst
0     0  to the right of    4
1     1   to the left of    8
2     1       sitting on   11
3     2  to the right of    5
4     2  to the right of    3
5     2  to the right of    9
6     2  to the right of   12
7     2   to the left of   10
8     3  to the right of   12
9     3   to the left of    2
10    3  to the right of    6
11    3  to the right of    5
12    4   to the left of    0
13    5   to the left of    2
14    5   to the left of    3
15    5   to the left of    9
16    6   to the left of    9
17    6   to the left of    3
18    8  to the right of    1
19    9  to the right of   12
20    9  to the right of    6
21    9  to the right of    5
22    9   to the left of    2
23   10  to the right of    2
24   12   to the left of    3
25   12   to the left of    2
26   12   to the left of    9