#include<bits/stdc++.h>
using namespace std;
int main(){
	long long a,b;
	while(cin>>a>>b){
		long long t;
		while(b>0){
			t=a%b;
			a=b;
			b=t;
		}
		cout<<a<<endl;
	}
	return 0;
}

`

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=1e6+19;
ll a[N];
int main()
{
	ll a,b,ans;
	while(cin>>a>>b)
	{
		ans=__gcd(a,b);
		cout<<ans<<"\n";
	}
	
	return 0;
}