#include <stdio.h>
int main() {
int h, p, f, d;
scanf("%d", &h);
scanf("%d", &p);
scanf("%d", &f);
scanf("%d", &d);
if(d== -1){
while(1){
if(f!=0) f--;
else f = 15;
if(f==h){
printf("S");
break;
}
else if(f==p){
printf("N");
break;
}
}
}
else{
while(1){
if(f!=15) f++;
else f = 0;
if(f==h){
printf("S");
break;
}
else if(f==p){
printf("N");
break;
}
}
}
return 0;
}
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