#include<iostream>  
#include<fstream>  
using namespace std;  
int cmmdc(int a,int b){  
if(!b)return a;   
else return cmmdc(b,a%b);}  
int main(){  
ifstream f("euclid2.in");   
ofstream g("euclid2.out");  
int n,a,b;  
f>>n;   
for(int i=0;i<n;i++){       
f>>a>>b;    
if(a>b)
g<<cmmdc(a,b)<<'\n';
else
g<<cmmdc(b,a)<<'\n';}
f.close();g.close();}