#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define MAXX 1000009
#define max_num 100000
#define pii pair<int,long>
vector<int>G[max_num];
int stringmod(string s,int a)
{
    int ans=0;
    for(int i=0;i<s.length();i++)
        ans=(ans*10+s[i]-'0')%a;
    return ans%a;
}
int gcd(int a,int b)
{
    if(b==0)return a;
    else
    return gcd(b,a%b);
}
int main() {
int t;
cin>>t;
while(t--)
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int a;
    cin>>a;
    string b;
    cin>>b;
    if(a==0)
     cout<<b<<endl;
    else
    {
        int bb=stringmod(b,a);
        cout<<gcd(a,bb)<<endl;
    }
}
   return 0;
}