#include <stdio.h>

int main() {
    int a, b, t;
    while (scanf("%d %d", &a, &b) != EOF) { // 注意 while 处理多个 case
        // 64 位输出请用 printf("%lld") to 
        if (a>b){
            t = a;
            a = b;
            b = t;
        }
        while(a%b!=0){
            t = a%b;
            a = b;
            b = t;
        }
        printf("%d",b);
    }
    return 0;
}