The result of running the script is:
Step 0
---------------------------------
A B C D E F G H
A 0 14 2 INF INF INF INF INF
B 14 0 8 INF 1 3 INF INF
C 2 8 0 INF INF INF 1 INF
D INF INF INF 0 7 10 INF INF
E INF 1 INF 7 0 1 INF INF
F INF 3 INF 10 1 0 3 1
G INF INF 1 INF INF 3 0 5
H INF INF INF INF INF 1 5 0
Step 1
---------------------------------
A B C D E F G H
A 0 10 2 INF 15 17 3 INF
B 10 0 8 8 1 2 6 4
C 2 8 0 INF 9 4 1 6
D INF 8 INF 0 7 8 13 11
E 15 1 9 7 0 1 4 2
F 17 2 4 8 1 0 3 1
G 3 6 1 13 4 3 0 4
H INF 4 6 11 2 1 4 0
Step 2
---------------------------------
A B C D E F G H
A 0 10 2 18 11 6 3 8
B 10 0 6 8 1 2 5 3
C 2 7 0 14 5 4 1 5
D 22 8 12 0 7 8 11 9
E 11 1 5 7 0 1 4 2
F 6 2 4 8 1 0 3 1
G 3 5 1 11 4 3 0 4
H 7 3 5 9 2 1 4 0
Step 3
---------------------------------
A B C D E F G H
A 0 9 2 16 7 6 3 7
B 8 0 6 8 1 2 5 3
C 2 6 0 12 5 4 1 5
D 14 8 12 0 7 8 11 9
E 7 1 5 7 0 1 4 2
F 6 2 4 8 1 0 3 1
G 3 5 1 11 4 3 0 4
H 7 3 5 9 2 1 4 0
Step 4
---------------------------------
A B C D E F G H
A 0 8 2 14 7 6 3 7
B 8 0 6 8 1 2 5 3
C 2 6 0 12 5 4 1 5
D 14 8 12 0 7 8 11 9
E 7 1 5 7 0 1 4 2
F 6 2 4 8 1 0 3 1
G 3 5 1 11 4 3 0 4
H 7 3 5 9 2 1 4 0