If I understood right.
data x;
input C1 C2 $;
cards;
1 A
2 A
3 A
4 B
3 B
5 B
1 C
6 C
;
run;
proc sql;
create table temp as
select c1,max(c2) as c2,count(*) as n
from x
group by c1
order by c1;
quit;
data want;
set temp;
length lag $ 40;
retain lag;
lag=lag(c2);
if n=1 and _n_ ne 1 then do;
if lag>c2 then c2=lag;
end;
drop n lag;
run;
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