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#include <fstream>
#include <iostream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long long n;
long long cmmdc(long long x,long long y){
if(y>x){int aux=x; x=y; y=aux;}
long long c;
while(y){
c=x%y;
x=y;
y=c;
}
return x;
}
int main()
{
f>>n;
for(long long i=1;i<=n;i++)
{
long long a,b;
f>>a>>b;
g<<cmmdc(a,b)<<endl;
}
return 0;
}