1 #include<cstdio>
 2 #include<cmath>
 3 int main()
 4 {
 5     int x,y;
 6     while(scanf("%d%d",&x,&y)!=EOF)
 7     {
 8         if(x==0&&y==0)return 0;
 9         if(x>y)return 0;
10         if((x<-39&&x>50)||(y<-39&&y>50))return 0;
11         int flag=1;
12         for(int i=x;i<=y&&flag;i++)
13         {
14             int k=i*i+i+41;
15             for(int j=2;j<=sqrt(k)&&flag;j++)
16                 if(k%j==0)flag=0;
17         }
18         if(flag)printf("OK\n");
19         else printf("Sorry\n");
20     }
21     return 0;
22 }