#include<iostream>
#include<cstdio>
#include<cstdlib>
using namespace std;
int main()
{
    int a,b,c;
    while(true)
 {
    cin>>a>>b;
    while(a>0)
    {
        if(b>a)
        {c=a;a=b;b=c;}
        a=a%b;
    }
    cout<<b<<endl;
  }
   
    return 0;
}