#include <iostream>
#include <cstring>
#define N 1001
using namespace std;
char s[N], c[N],t[N];
int n,m,k,i;
int main()
{

    cin>>s;
    cin>>c;
    n=strlen(s);
    m=strlen(c);
    if(n!=m) {cout<<"cod incorect"; return 0;}
    for(i=n-1;i>=0;i--)
        if(c[i]%2==0) ///'0' -48
          t[k++]=s[i];
    for(i=0;i<n;i++)
        if(c[i]%2==1)t[k++]=s[i];
    t[k]=NULL;
    cout<<t;
    return 0;
}