I would like to extract and remove some texts from the below

`[root@test]# du -k ./[a-zA-Z0-9] --max-depth=1 | sort -hr`

Before

```
    7789696 ./b/bklee
    946792  ./a
    796588  ./b/bluecyn
    477860  ./b/bborikun
    473652  ./b/bluechiper
    220780  ./a/ara316
    144244  ./a/aceload
    131088  ./b/belivart
    79108   ./a/athlon85
    78644   ./b/beschur512
    66264   ./b/bogdanov
    52460   ./A

```

After

```
    796588  bluecyn
    477860  bborikun
    473652  bluechiper
    220780  ara316
    144244  aceload
    131088  belivart
    79108   athlon85
    78644   beschur512
    66264   bogdanov

```

what I want is to remove the repetitive pattern, "./a/" and lines that only prints out like "/a"
I am trying to figure it out but since I am a beginner at AWK and SED, I need some help.

Thanks!