extracting the part of string

[SAS_inquisitive]

How to get the last 4 digits of SSN from this data?

data SSN;
  input SSN $;
  cards;
  123456789
  12345678
  1234567
  ;
run;

[data_null__]

last4 = substrn(ssn,lengthn(ssn)-4+1);

[FreelanceReinh · Accepted solution]

With your data step you lose already the "9" in the first row.

data SSN;
input SSN :$9.; /* The default length 8 is insufficient! */
cards;
123456789
12345678
1234567
;
run;

data want;
set ssn;
length last4d $4;
last4d=substr(ssn,length(ssn)-3);
run;