Const
maxM =1000;
Var
n, m, i, j, x, y :integer;
A, B :ansistring;
F :Array[0..1 ,0..maxM] of ansiString;
function Max(Ax, Bx :ansiString) :ansiString;
var
T1,T2 :ansistring;
begin
if (Ax = '') then Exit(Bx);
if (Bx = '') then Exit(Ax);
T1:=Ax;
T2:=Bx;
while (Length(T1) < Length(T2)) do
T1:='0'+T1;
while (Length(T2) < Length(T1)) do
T2:='0'+T2;
if (T1>T2) then
Exit(Ax)
else
Exit(Bx);
end;
Begin
{$ifndef ONLINE_JUDGE}
assign(input,'dp.inp');reset(input);
assign(output,'dp.out');rewrite(output);
{$endif}
ReadLn(A);
n:=Length(A);
ReadLn(B);
m:=Length(B);
x:=0;
y:=1;
for i:=1 to n do
begin
for j:=1 to m do
if (A[i]=B[j]) then
F[y,j]:=F[x,j-1]+B[j]
else
F[y,j]:=Max(F[y,j-1],F[x,j]);
x:=1-x; y:=1-y;
end;
if length(f[x,m])=0 then
begin
writeln(0);
write('LCS MAX NUMBER is NULL');
exit;
end;
while (F[x,m,1]='0') and (Length(F[x,m])>1) do
Delete(F[x,m],1,1);
writeln(length(f[x,m]));
if length(f[x,m])=0 then
write('LCS MAX NUMBER is NULL')
else
Write('LCS MAX NUMBER is ',F[x,m]);
End.
