F1:
=IF(ISNA(MATCH($A1,B$1:B$4,0)),IF(ISNA(MATCH($A1,C$1:C$4,0)),IF(ISNA(MATCH($A1,D$1:D$4,0)),IF(ISNA(MATCH($A1,E$1:F$4,0)),"",$A1),$A1),$A1),$A1)
F2:
=IF(ISNA(MATCH($A2,B$1:B$4,0)),IF(ISNA(MATCH($A2,C$1:C$4,0)),IF(ISNA(MATCH($A2,D$1:D$4,0)),IF(ISNA(MATCH($A2,E$1:F$4,0)),"",$A2),$A2),$A2),$A2)