题解

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