#include <bits/stdc++.h>
using namespace std;
bool ss(int n){
    for(int i=2;i<n;i++){
        if(n%i==0){
            return 0;
        }
    }
    return 1;
} 
int main(){
    int i,n,s=0;
    char a[99];
    cin>>a;
    for(i=0;i<strlen(a)-2;i++){
        if(ss((a[i]-48)*10+(a[i+1]-48))&&ss((a[i]-48)+(a[i+1]-48)*10)){
            if(s==0){
                s++;
            }
            else
                cout<<",";
            cout<<(a[i]-48)*10+a[i+1]-48;
        }
    }
}
/**************************************************************
	Problem: 1138
	User: linzihang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/