#include <iostream>
#include <fstream>
#include <math.h>


using namespace std;
/*
int cmmdc (int x, int y) {
    int r;
    while (y) {
        r = x % y;
        x = y;
        y = r;
    }
    return x;
}
*/
int gcd(int a, int b)
{
    if (!b) return a;
    return gcd(b, a % b);
}

int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int i, t, a, b; f>>t;
    for (i=1; i<=t; i++) {
        f>>a>>b;
        g<<gcd(a,b)<<endl;
    }
}