加个n=_n_;
proc sort  按n倒序排列

帅气

No. That is NOT the right way. There is no sorted needed.

data a;
input x $;
cards;
a
e
s
;

data b;
   do point=nobs to 1 by -1;
      set a nobs=nobs point=point;
          output;
        end;
   stop;
run;

proc print;run;

楼上的才是正解