解

#include<iostream>
#include<string>
using namespace std;
int main(){
    string a,b;
    cin >> a >> b;
    int lena=a.size(),lenb=b.size();
    if(lena<lenb)
        cout << a << endl << b;
    else if(lenb<lena)
        cout << b << endl << a;
    else{
        if(a<b)
            cout << a << endl << b;
        else
            cout << b << endl << a;
    }
    return 0;
}