This is my text file:

```
0019121002313002316003135  
0057936000814000814003023  
0081638001519001523001176  
0090531001841001842002633  
0111210001515001518000912  
0115400001807001828001593

```

I want the processed output as:

```
0019121,002313,002316,003135
0057936,000814,000814,003023
0081638,001519,001523,001176
0090531,001841,001842,002633
0111210,001515,001518,000912
0115400,001807,001828,001593

```

How do I do this?