0
被禁言
资深守护
#include<iostream>
#include<string>
#include<cstdio>
#include<cmath>
#include<algorithm>
using namespace std;
int main(){
string a,b;
cin>>a>>b;
if((a[a.size()-1]-'0'+b[b.size()-1]-'0')%10<=4){
for(int i=a.length()-1;i>=0;i--){
cout<<a[i];
}
cout<<endl;
for(int i=b.length()-1;i>=0;i--){
cout<<b[i];
}
}
else{
cout<<b+a;
}
return 0;
}
