# include<iostream> using namespace std; bool is_sushu(int x){ if(x==0||x==1)return 0; for(int s=2; s<=x/s; s++)if(x%s==0)return 0; return 1; } int main(){ int n, m, m1=0, m2=0, sum=0, sushu[100000]; cin>>m>>n; for(int i = m; i <= n; i++)if(is_sushu(i)){ m1=i; m2=0; for(int j=0; m1>0; j++){ m2=m2*10+m1%10; m1/=10; } if(is_sushu(m2)){ sushu[sum]=i; sum++; } } if(sum>0){ for(int i=0; i<sum; i++){ cout<<sushu[i]; if(i+1!=sum)cout<<","; } }else cout<<"No"; return 0; }