public class shuchusushu {
public static void main(String args[]){
int a[]=new int[201];
int n=-1;
for(int i=3;i<=200;i++){
int m=0;
for(int j=2;j<=i-1;j++){
if(i%j==0){
m++;
}
if(j==i-1){
if(m==0){
n++;
a[n]=i;
}
}

}
}
System.out.println(1);
System.out.println(2);
for(int i=0;i<=n;i++){
System.out.println(a[i]);
}
}
}