#include <stdio.h>
int main()
{
    int x,y,x1,y1;
    scanf("%d %d\n%d %d",&x,&y,&x1,&y1);
    if(x1-x==0 && y1 >y)
        printf("u");
    else if(x1-x==0 && y1 <y)
        printf("d");
    else if(x1 > x && y1-y1==0)
        printf("r");
    else if(x1 < x && y1-y1==0)
        printf("l");
    return 0;
}