include

include

using namespace std;

int main()

{

string a,b;

cin>>a>>b;

int l;

l=a.size();

int s1,s2;

int num1[l],num2[l];

s1=s2=0;

for(int i=0;i=0;i--) {

s1-=num1[i];

if (s1%2!=0) num1[i]=1-num1[i];

s2-=num2[i];

if (s2%2!=0) num2[i]=1-num2[i];

}

int q;

q=1;

s1=s2=0;

for(int i=l-1;i>=0;i--) {

s1+=num1[i]*q;

s2+=num2[i]*q;

q*=2;

}

if (s2>s1) cout