题解

#include <bits/stdc++.h>
using namespace std;
int main(){
string s,s1="",s2="";
cin>>s;
for(int i=0;i<s.size();i++)
if(i%2==0) s2+=s[i];
else s1+=s[i];
if(s1>s2)
{
s1+=s2;
cout<<s1<<endl;
}
else
{
s2+=s1;
cout<<s2<<endl;
}

return 0;

}