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OriginalPostID-111174
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Though its an old post, just too add value to new readers In case if some one looking for answer with function "a!forEach"..
The answer is inspired from older replies. Thank you ..
a!forEach( items: enumerate(len(ri!inp)), expression: charat(ri!inp, fv!index) )
charat(ri!string, enumerate(len(ri!string)) + 1)