I have the following table:

```
+------------------+
|   ColumnName     |
+------------------+
| 1 Slap           |
+------------------+
| 13 Slap          |
+------------------+
| 2 Slap           |
+------------------+

```

With only MySQL how can I parse that ColumnName to only grab the numerical value and add them all up?

The output of the query should be 16 if doing it on the above table.