How to put alphabet one by one that makes a word (string)?

[PULSE.Wannabe]

I'm making a program which I choose an alphabet one by one in the run process, I only know how to put several string into 1 strings using concatenate strings , but it is only for before the program runs, is it possible to put alphabet one by one in the " run " process and combined into 1 output string?

[PULSE.Wannabe]

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[altenbach · Accepted solution]

You need an initialized shift register (anchored in the lower while loop) for the string, then append or not depending in the situation.