能过样历

#include<bits/stdc++.h>
using namespace std;
int main(){
	string a,b,c,d;
	getchar();
	cin>>a>>b>>c>>d;
	for(int i=0;i<a.size();i++){
		if(c[i]<a[i]){
			swap(a[i],c[i]);
			swap(b[i],d[i]);
		}
		else if(a[i]==c[i]){
			if(d[i]<b[i]){
				swap(a[i],c[i]);
				swap(b[i],d[i]); 
			}
		}
	}
	cout<<b;
	return 0;
}