https://www.acwing.com/problem/content/description/874/
#include<cstdio>
#include<iostream>
using namespace std;
int gcd(int a,int b)
{
return b?gcd(b,a%b):a;
}
int main(void)
{
int n; cin>>n;
while(n--)
{
int a,b; cin>>a>>b;
cout<<gcd(a,b)<<endl;
}
return 0;
}