#include <stdio.h>
#include <math.h>

int main () {

    int l,c,r1,r2,diagonal,diametro,stack;
    stack=1;



    while (stack!=0){

        scanf("%d %d %d %d",&l,&c,&r1,&r2);

        stack=l+c+r1+r2;

        if (stack==0) {

            return 0;
        }

        diametro=(r1*2) + (r2*2);

        diagonal=(l*l) + (c*c);
        diagonal=sqrt(diagonal);


        if (diametro<diagonal) {

            printf("S\n");
        }

        else {
            printf("N\n");
        }

    }


    return 0;
}