#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

#define rep(i, from, to) for (int i = from; i < (int)to; ++i)
#define trav(a, x) for (auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
typedef long long ll; 
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef vector<int> vi;

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

int main() {
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);
    int t; cin >> t;
    for (int i = 0; i < t; i++) {
        int a, b;
        cin >> a >> b;
        cout << gcd(a, b) << endl;
    }
}