[Tutor] Encoding

[Nidian Job-Smith]

Hi all,
In my programme I am encoding what the user has in-putted. 
What the user inputs will in a string, which might a mixture of letters and numbers.
However I only want the letters to be encoded. 

Does any-one how I can only allow the characters to be encoded ??
Big thanks,

 		 	   		  
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