//
//  info_arena_1.cpp
//  LearningC++
//
//  Created by Stefan Tiegel on 23.10.15.
//  Copyright © 2015 Stefan Tiegel. All rights reserved.
//

#include <stdio.h>
#include <algorithm>
#include <math.h>
#include <string>

int n;
int a, b;

using namespace std;

int gcd(int a, int b) {
    
    if (b == 0) {
        return a;
    }
    
    return gcd(b, a % b);
}

int main() {
    
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);
    
    scanf("%d", &n);
    
    for (int i = 1; i <= n; i++) {
        
        scanf("%d %d", &a, &b);
        
        printf("%d\n", gcd(a, b));
    }
    
    return 0;
}