begin
readln(s1);
readln(s2);
ln1:=length(s1);
for i:=ln1 downto 1 do
for j:=1 to ln1-i+1 do
st:=copy(s1,j,i);
n:=pos(st,s2);
if n>0 then break;
end;
writeln(st);
end.
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