a = int(input());
b = a // 100;
s = a // 10 % 10;
g = a % 10;
if b < s :
    t = b;
    b = s;
    s = t;

if b < g :
    t = b;
    b = g;
    g = t;

if s < g :
    t = s;
    s = g;
    g = t;

print(b * 100 + s * 10 + g);


/**************************************************************
	Problem: 1042
	User: admin
	Language: Python
	Result: Accepted
	Time:95 ms
	Memory:34480 kb
****************************************************************/