Tokenize A String - Removing Numeric From A TreeSet

I am using a TreeSet to tokenize a string. The output is sorted with numeric first followed by words

E.g. 13 26 45 and before etc.....................

Is there a tidy way to remove the numeric?

Last bit of my code is :-

// print the words separating them with a space
for(String word : words) {
System.out.print(word + " ");
}
} catch (FileNotFoundException fnfe) {
System.err.println("Cannot read the input file - pass a valid file name");
}