#include <bits/stdc++.h>
using namespace std;
const int N=2e5+20;

inline int read()
{
	int k=0,f=1;
	char ch=getchar();
	while(ch<'0' || ch>'9'){if(ch=='-') f=-1;ch=getchar();}
	while(ch>='0' && ch<='9'){k=(k<<1)+(k<<3)+ch-'0';ch=getchar();}
	return f*k;
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);
    int a,b;
    scanf("%d-%d",&a,&b);
    if(a<b) cout<<b<<'-'<<a;
    else cout<<a<<'-'<<b;
	return 0;
}