I have a string with single letter codes like  

MGCLGNSKTEDQRNEEKAQREAMGCLGNSKTEDQRNEEKAQREAMGCLGNSKTEDQRNEEKAQREA  

I would like to print a serial number over each letter in the string. 

like 

```
123456789101112131415161718192021222324252627282930  
MGCLGNSKTED Q R N E E K A Q R E A M G C L G N S K T  

```

thanks in advance.