#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <math.h>
using namespace std;
int i,j,k,ac,bc,tc,ga,gb,a0c,b0c,a[7],b[7];
main()
{
char n[15];
fgets(n, 15, stdin);
fill(a,a+7,0);
fill(b,b+7,0);
for(i=j=k=0;i<strlen(n);i++){
if(k>6)break;
if(n[i]==' '){j=1;ga=i;}
else if(!j){if(n[i]!=48)a[i]=n[i]-48;else a0c++;}
else{if(n[i]!=48)b[k++]=n[i]-48;else b0c++;}
}
gb=strlen(n)-ga-1;
ac=count(a,a+7,0)-a0c;
bc=count(b,b+7,0)-b0c;
tc=abs(ac-bc);
if(ac!=bc){
if(ac>bc){
for(i=0;i<tc;i++){
printf("%d",b[i]);
}
for(j=0;i<gb;i++,j++){
printf("%d",a[j]+b[i]);
}
}
else{
for(i=0;i<tc;i++){
printf("%d",a[i]);
}
for(j=0;i<ga;i++,j++){
printf("%d",a[i]+b[j]);
}
}
}
else{
for(i=0;i<7-ac;i++){
printf("%d",a[i]+b[i]);
}
}
}
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