How to distinguish between numerical data and alphanumeric title

Hello,

	I have the folowing problem :

My data file contains one or more blocks composed of a title and a set 
of numerical data. After one block it reads an other:

  how to stop the calculation if I encounter a  line of numerical data 
instead of a title. I consider a title as it contains at least one non 
numerical character (for example       Case Nr3  a=1.2, b=6., c=80.)

Thanks for your help

Bernard Bru