nwd

#include<iostream>
    using namespace std;

    int NWD (int a, int b)
    {
    int c;
    while (b != 0)
    {
    c = a % b;
    a = b;
    b = c;
    }
    return a;
    }

    /////////////////////////


    int main()
    {
    int size=0,nwd[4],temp=0;
    cin>>size;
    while(size>0){
    int tab[4];
    for (int i=0; i<4; i++) cin>>tab[i];
    nwd[0]=NWD(tab[0],tab[1]);
    temp=nwd[0];

    for (int m=0; m<3; m++)
    {
    temp=NWD(nwd[m],tab[m+1]);
    nwd[m+1]=temp;
    }

    cout << temp<< endl;
    temp=0;
    nwd[0]=0;
    tab[0]=0;
    --size;
    }
    return 0;
    }