What is the letter on?
The letter is on the tennis racket.
    src        edge_attr  dst
0     0  to the right of    9
1     1   to the left of   21
2     1   to the left of    5
3     1   to the left of   14
4     1   to the left of   13
5     3   to the left of   11
6     3   to the left of   16
7     4           behind   18
8     5  to the right of    1
9     5  to the right of   12
10    7               on   19
11    9   to the left of   10
12    9   to the left of    0
13   10               of   11
14   10  to the right of    9
15   11          holding   19
16   11          wearing   20
17   11          wearing    9
18   11          wearing    5
19   11          wearing    6
20   11          wearing    2
21   11          wearing   14
22   11         swinging   19
23   11  to the right of    3
24   11      in front of   18
25   12   to the left of   13
26   12   to the left of    5
27   12   to the left of   21
28   12   to the left of   14
29   13  to the right of   12
30   13  to the right of    1
31   14  to the right of    1
32   14  to the right of   12
33   16               of   11
34   16  to the right of    3
35   17           behind   18
36   18           behind   11
37   18      in front of    4
38   21  to the right of    1
39   21  to the right of   12