题解

#include <bits/stdc++.h>
using namespace std;
string a,b;

void two(string a,string b)
{
int len=a.size();
if(len==0) return;
int pos=a.find(b[len-1]);
cout<<b[len-1];
two(a.substr(0,pos),b.substr(0,pos));
two(a.substr(pos+1,len-pos-1),b.substr(pos,len-pos-1));
}

void work()
{
cin>>a>>b;
two(a,b);
return;
}

int main(){
work();
return 0;
}