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#include<iostream>
using namespace std;
long long int cal(long long int n1,long long int n2)
{
if (n1 == n2) return n1;
if (n1 > n2) return cal(n1 / 2, n2);
return cal(n1, n2 / 2);
}
int main()
{
long long int n1, n2;
while(cin >> n1 >> n2)
cout<<cal(n1, n2)<<endl;
}
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