CppPrimer_ex5_19

#include <iostream>
#include <vector>
using namespace std;

int main() {
    
    string s1, s2, resp;
    
    do{
        cout << "Please enter two string!";
        cin>>s1>>s2;
        cout << (s1<s2?s1:s2)
             << endl
             << "More? Enter yes or no.";
        cin>>resp;
    }while(!resp.empty() && resp[0]!='n');

    return 0;
}