Have 8 variables (CHAR1 to CHAR8). Create 26 links. In the script of each link, input:
IF %CHAR1 = 0 THEN %CHAR1 := (number)
IF %CHAR1 > 0 AND %CHAR2 = 0 THEN %CHAR2 := (number)
IF %CHAR2 > 0 AND %CHAR3 = 0 THEN %CHAR3 := (number)
IF %CHAR3 > 0 AND %CHAR4 = 0 THEN %CHAR4 := (number)
IF %CHAR4 > 0 AND %CHAR5 = 0 THEN %CHAR5 := (number)
IF %CHAR5 > 0 AND %CHAR6 = 0 THEN %CHAR6 := (number)
IF %CHAR6 > 0 AND %CHAR7 = 0 THEN %CHAR7 := (number)
IF %CHAR7 > 0 AND %CHAR8 = 0 THEN %CHAR8 := (number)