#include <iostream>
using namespace std;
 
int prim(int n) {
    if (n <= 1) return 0;
    for (int i = 2; i * i <= n; i++) {
        if (n % i == 0) return 0;}
        return 1;
}
 
int main() {
     int n , m, ok = 0, x;
    cin >> n >> m;
    for(int i = 1; i <= n; i++) {
         cin >> x;
        if(!prim(x)) {
            ok = 1;
            cout << x << ' ';
        }
        else ok = 0;
        for(int j = 2; j <= m; j++) {
             cin >> x;
            if(ok)
                cout << x << ' ';
        }
        if(ok) cout << '\n';
    }
}
 

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4 20 15 23 18 9 
17 15 13 18 12 1 
15 8 23 23 14 18 
3 18 8 23 12 15