(I)    ABCD  +  EFGH  =  KLBK
         :        -        +
(II)     LL  +  EFFC  =  EFDL
       ----------------------
(III)   EGA  *    AH  =  DGFG
       (IV)      (V)     (VI)


(II.1)   C = 0
(V.2)    G = F + A
(II.2)   D = F + L
(I.2)    B = G + 1
(IV.1)   L * A == D (mod 10)  so L >= 2.
Assume E >= 2 then E*L<=6<=A from (IV).
Further A+E<=8<=K from (I) and K+E<=10<=D.
Therefore E = 1.
(VI.1)   G == K + L
(VI.3)   G == F + L + 1  there must be a carry otherwise K=F.
So K = F + 1 and G = D + 1 and then A = L + 1
(I.4)    A + 1 <= K <= A + 2
So K = A + 2 otherwise F=A. That is F = A + 1.


       3806  +  1479  =  5285
         :        -        +
         22  +  1440  =  1462
       ----------------------
        173  *    39  =  6747