#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min()\fabs() #include<ctime> #include<cstdlib> using namespace std; int main(){ char a[1001],b[1001]; int p=0,q=0,sum1=0,sum2=0; cin>>a>>b; p=strlen(a); q=strlen(b); for(int i=0;i<p;i++){ if(a[i]<='9' && a[i]>='0') sum1++; } for(int i=0;i<q;i++){ if(b[i]<='9' && b[i]>='0') sum2++; } if(sum1>sum2){ for(int i=q-1;i>=0;i--) cout<<b[i]; cout<<a[sum1-1]; } else{ for(int i=p-1;i>=0;i--) cout<<a[i]; cout<<b[sum2-1]; } return 0; }