grading

Assuming the items are in A1:P1, try:

=IF(COUNTIF($A$1:$P$1,"A"),COUNTIF($A$1:$P$1,"A")&"A","")&IF(COUNTIF($A$1:$P$1,"B"),COUNTIF($A$1:$P$1,"B")&"B","")&IF(COUNTIF($A$1:$P$1,"C"),COUNTIF($A$1:$P$1,"C")&"C","")&IF(COUNTIF($A$1:$P$1,"D"),COUNTIF($A$1:$P$1,"D")&"D","")&IF(COUNTIF($A$1:$P$1,"E"),COUNTIF($A$1:$P$1,"E")&"E","")

adjust as necessary