#include <iostream>
using namespace std;
int main(){
    int a,b,c,d,k=0;
    cin >> a >> b >> c >> d;
    while(a<c){
        if(k==0){
            k = 1;
            a += b;
            cout << a << " ";
        } else {
            k = 0;
            c -= d;
            cout << c << " ";
        }
    }
    cout << a ;
    return 0;
}