Data Type Oracle PLSQL

SQL> declare
  2       val     varchar2(100);
  3       city    varchar2(20) := 'TORONTO';
  4  begin
  5       val := CASE city
  6                    WHEN 'TORONTO' then 'RAPTORS'
  7                    WHEN 'LOS ANGELES' then 'LAKERS'
  8                    WHEN 'BOSTON' then 'CELTICS'
  9                    WHEN 'CHICAGO' then 'BULLS'
 10                    ELSE 'NO TEAM'
 11              END;
 12
 13       dbms_output.put_line(val);
 14  end;
 15  /
RAPTORS
PL/SQL procedure successfully completed.