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#include<stdio.h>
#include<math.h>
int nt(int n){
for (int i=2;i<=sqrt(n);i++){
if (n%i==0){
return 0;
}
}
return n>1;
}
int main(){
int n,a[100];
int dem;
scanf("%d",&n);
for (int i=1;i<=n;i++){
scanf("%d",&a[i]);
}
for (int i=1;i<=n;i++){
if (nt(a[i])!=0){
dem++;
}
}
printf("%d ",dem);
for (int i=1;i<=n;i++){
if (nt(a[i])!=0){
printf("%d ",a[i]);
}
}
return 0;
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