var 39 s3 ex 4

#include <iostream>
#include <fstream>

using namespace std;

unsigned int pr(unsigned int x) {
    if(x < 2) {
        return 0;
    }
    for(unsigned int div = 2; div*div <= x; ++div) {
        if(x%div == 0) {
            return 0;
        }
    }
    return 1;
}

int main() {
    ifstream fin("date.in");
    unsigned int n;
    fin >> n;
    while(n >= 100) {
        n /= 10;
        if(pr(n)) {
            cout << n << " ";
        }
    }
}