#include <stdio.h>

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

int main()
{

    int a, b;
    while (scanf("%d %d", &a, &b) != EOF)
    {
        printf("%d\n", gcd(a, b));
    }

    return 0;
}