Use this in D1, copied down...

=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A1,MID(B1,1,1),""),MID(B1,2,1),""),MID(B1,3,1),""),MID(C1,1,1),""),MID(C1,2,1),""),MID(C1,3,1),"")