#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a,int b){
    int c;
    while(b){
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}
int main(){
    int t;
    fin>>t;
    for(int i=1;i<=t;i++){
        int a,b;
        fin>>a>>b;
        fout<<cmmdc(a,b)<<'\n';
    }
    return 0;
}