Another erlangish
-module(rosetta).
-compile(export_all).
test() ->
rosetta("ZYEEEEEABBCCCDDDDF").
rosetta([H|T]) ->
rosetta([], [H], T).
rosetta(L, [H|_]=Act, [H|T1]) ->
rosetta(L, [H|Act], T1);
rosetta(L, Act, [H|T]) ->
rosetta([Act|L], [H], T);
rosetta(L, Act, []) ->
lists:reverse([Act|L]).
maciek
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