Google Sheets, 93 bytes
=SORT(JOIN(,IFNA(CHAR(SCAN(,SPLIT(A1,"-",,),LAMBDA(a,c,MOD(a+LEN(c),256)))-COLUMN(A:ZZ)+1))))
z..
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=SORT(JOIN(,IFNA(CHAR(SCAN(,SPLIT(A1,"-",,),LAMBDA(a,c,MOD(a+LEN(c),256)))-COLUMN(A:ZZ)+1))))