chertezhnik

#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
    int a,b,c,d;
    cin >> a >> b >> c >> d;
    int r = abs(a + c);
    int k = abs(b + d);
    int n = min(r,k);
    for(int i = 1; i <= n; i++){
        if(r % i == 0 && k % i == 0){
            cout << i << endl;
        }
    }
    return 0;
}