#include <iostream>
using namespace std;
bool yes(int a){
for(int i=2;i<a;i++){
if (a%i==0)return false;
}
return true;
}
int main() {
int n;
cin>> n;
int* a= new int[n];
for(int i =0;i<n;i++){
cin>>a[i];
}
int p=n-1;
for(int i=0;i<p;i++){
if(yes(a[i])){
int t=a[i];
for(int j=i;j<p;j++){
a[j]=a[j+1];
}
a[p]=t;
p--;
i--;
}
}
for(int i=0;i<n;i++){
cout<<a[i];
}
delete[] a;
return 0;
}
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