题解

#include <bits/stdc++.h>
using namespace std;
int main(){
string s1,s2;
cin>>s1>>s2;
if(s1<s2) cout<<s1<<" "<<s2<<endl;
else if(s1>s2) cout<<s2<<" "<<s1<<endl;
else cout<<s1<<endl;
return 0;
}