#include<stdio.h>   

int main(){ 
	int x;
	scanf("%d",&x);
	
	int a = x / 100;
	int b = x / 10 % 10;
	int c = x % 10;
	
	
	if(a < b){
		int t = a;
		a = b;
		b = t;
	}
	
	if(b < c){
		int t = b;
		b = c;
		c = t;
	}
	
	if(a < b){
		int t = a;
		a = b;
		b = t;
	}
	
	printf("%d",a * 100 + b * 10 + c);

	return 0;
} 
/**************************************************************
	Problem: 1042
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/