This program does it: %let str = %str(i just want to play a Game); %let len = %length(&str); data _null_; length str_in str_out $ &len; str_in = "&str"; do i = 1 to &len; substr(str_out, i, 1) = substr(str_in, &len + 1 - i, 1); end; put str_in= str_out=; run;
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