URI Collectable Cards

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#include<bits/stdc++.h>
using namespace std;

int main()
{
    int t;
    cin >> t;
    while(t--)
    {
        int a,b,r=1;
        cin >> a >> b;
        if(a > b)
        {
            swap(a,b);
        }

        // gcd

        while(r)
        {
            r = b % a;
            b = a;
            a = r;
        }

        cout << b << endl;
    }

    return 0;
}

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