不正经题解，但极简单

#include<bits/stdc++.h>
using namespace std;
int main(){
string a,b;
cin>>a>>b;
if(a>b){
cout<<b<<" "<<a;
return 0;
}
if(a==b){
cout<<a;
return 0;
}
cout<<a<<" "<<b;
return 0;
}