public class Main{
    public static void main(String args[]){
        int a[] = {1,3,5,7};
        int tmp = a[0];
        a[0] = a[2];
        a[2] = tmp;
        tmp = a[1];
        a[1] = a[3];
        a[3] = tmp;
        
        for(int num : a){
            System.out.print(num + " ");
        }
    }
}