#include <iostream>
using namespace std;

int gcd(int a, int b){
    while(a%b){
        int r = a%b;
        a = b;
        b = r;
    }
    return b;
}

int main(){
    int n;
    cin >> n;
    for (int i = 1; i <= n; i ++ ){
        int a, b;
        cin >> a >> b;
        cout << gcd(a, b) << endl;
    }
    return 0;
}