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#include <stdio.h>
#include <stdlib.h>
using namespace std;
int n;
struct per{
int a, b;
}pereche;
int rezolvare(int a,int b){
if(!b) return a;
else rezolvare(b, a%b);
}
int main()
{
freopen("euclid2.in", "r", stdin);
freopen("euclid2.out", "w", stdout);
scanf("%d", &n);
for(int i=1; i<=n; i++){
scanf("%d %d", &pereche.a, &pereche.b);
printf("%d\n", rezolvare(pereche.a, pereche.b));
}
return 0;
}