$0 = 0
$1 = 0
$2 = 0
while(A[$1 + 1,$2 + 1] == B[$1 + 1,$2 + 1])
    $0 = $0 + 1
    $1 = $0 / H
    $2 = $0 % H
end
return($1+1,$2+1)