#include <iostream>
#include <fstream>
#include <vector>
#include <bitset>
#include <algorithm>
#include <cstring>
#include <cctype>
#include <thread>

#define pb push_back
#define mp make_pair
#define MAXN 100001
#define DIM 4096

using namespace std;

class Reader
{
public:
    Reader(const char* filename)
    {
        f.open(filename);
        pos = 0;
        f.read(buffer,DIM);
    }
    inline Reader& operator >>(int& x)
    {
        x=0;
        sgn=1;
        while((buffer[pos]<'0'||buffer[pos]>'9')&&buffer[pos]!='-')
            if(++pos==DIM)
                f.read(buffer,DIM),pos=0;
        if(buffer[pos]=='-')sgn=-1,pos++;
        while(buffer[pos]>='0'&&buffer[pos]<='9')
        {
            x=x*10+buffer[pos]-'0';
            if(++pos==DIM)f.read(buffer,DIM),pos=0;
        }
        x*=sgn;
        return (*this);
    }
    inline Reader& operator >>(char* c)
    {
        aux = 0;
        while(isspace(buffer[pos]))
            if(++pos==DIM)
                f.read(buffer,DIM),pos=0;
        while(!isspace(buffer[pos]))
        {
            c[aux++]=buffer[pos];
            if(++pos==DIM)f.read(buffer,DIM),pos=0;
        }
        return (*this);
    }
    ~Reader()
    {
        f.close();
    }
private:
    ifstream f;
    int pos,aux,sgn;
    char buffer[DIM];
};

class Writer
{
public:
    Writer(const char* filename)
    {
        g.open(filename);
        pos = 0;
    }
    inline Writer& operator <<(int xx)
    {
        aux = 0;
        x = xx;
        if(xx<0)x=-x;
        if(x==0)
            nr[aux++]='0';
        while(x)
        {
            nr[aux++]=x%10+'0';
            x/=10;
        }
        if(xx<0)nr[aux++]='-';
        while(aux>0)
        {
            buffer[pos++]=nr[--aux];
            if(pos==DIM)g.write(buffer,DIM),pos=0;
        }
        return (*this);
    }
    inline Writer& operator <<(const char* c)
    {
        aux = 0;
        while(c[aux])
        {
            buffer[pos++]=c[aux++];
            if(pos==DIM)g.write(buffer,DIM),pos=0;
        }
        return (*this);
    }
    ~Writer()
    {
        g.write(buffer,pos);
        g.close();
    }
private:
    ofstream g;
    int pos,aux,x;
    char buffer[DIM],nr[21];
};

Reader f("euclid2.in");
Writer g("euclid2.out");

int t,a,b,n,i,j;
int* sol;
void cmmdc(int a, int b)
{
    int aux;
    while(b)
    {
        aux=a%b;
        a=b;
        b=aux;
    }
    g<<a<<"\n";
}



int main()
{
    ios_base::sync_with_stdio(false);
    f>>t;
    /*n=thread::hardware_concurrency();
    thread* th = new thread[n];
    sol = new int[n];*/
    for(i=1;i<=t;i++)
    {
        f>>a>>b;
        cmmdc(a,b);
        /*th[j++]=thread(cmmdc,a,b,i%n);
        if(j==n)
        {
            while(j)
                th[--j].join();
            for(j=0;j<n;j++)
                g<<sol[j]<<"\n";
            j=0;
        }
        */
    }
    /*i=j;
    while(j)
        th[--j].join();
    for(j=0;j<i;j++)
        g<<sol[j]<<"\n";
    */
    return 0;
}