program filip;
var a,b,c,d,y,x2,x3,x4,y3,y4,i3,i4,y2,x,i2,i:longint;
BEGIN

readln(a);
readln(b);

x:=a mod 1000;
x2:= x div 100;


y:=a mod 100;
y2:=y div 10;


i:=a mod 10;
i2:= i div 1;


x3:=b mod 1000;
x4:=x3 div 100;

y3:=b mod 100;
y4:=y3 div 10;

i3:=b mod 10;
i4:=i3 div 1;

c:=x2*1+y2*10+i2*100;



d:=x4*1+y4*10+i4*100;


if c >= d then writeln (c);
if c < d then writeln(d);



end.