C++ :

#include<bits/stdc++.h>
using namespace std;
bool sushu(int n) {
	int i;
	bool f=true;
	if (n<=1) {
		f=false;
	}
	for (i=2;i<=sqrt(n);i++) {
		if (n%i==0) {
			f=false;
		}
	}
	return f;
}
int main(){
	char s[30];
	int i,t,x,f=0;
	gets(s);
	for (i=0;i<strlen(s)-1;i++) {
		t=(s[i]-48)*10+(s[i+1]-48);
		x=(s[i+1]-48)*10+(s[i]-48);
		if (sushu(t)==true && sushu(x)==true) {
			if (f==0) {
				cout<<t;
				f++;
			} else {
				cout<<","<<t;
			}
		}
	}

    return 0;
}

Pascal :

var a:array['0'..'9']of boolean;
    c,c1:char;
    i,j,k:integer;
function isprime(n:integer):boolean;
var i:integer;
begin
  for i:=2 to trunc(sqrt(n)+1) do
    if n mod i=0 then exit(false);
  exit(true);
end;
begin
  while true do
  begin
    read(c);
    if(c>='0')and(c<='9')and(ord(c) mod 2=1)then a[c]:=true
      else if c='%' then break;
  end;
  for c:='1' to '7' do
    for c1:=chr(ord(c)+2) to '9' do
      if a[c] and a[c1] then
      begin
        i:=ord(c)-48;
        j:=ord(c1)-48;
        if isprime(i*10+j) and isprime(j*10+i) then
        begin
          if k>0 then write(',');
          write(i,j,',',j,i);
          k:=1;
        end;
      end;
  writeln;
end.

Java :

import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String n = sc.next();
		int[] a = new int[n.length()-1];
		for (int i = 0;i<n.length()-1;i++) {
			a[i]= n.charAt(i) - '0';
		}
		String s = "";
		for (int j = 0;j<n.length()-2;j++) {
			int k =j+1;
			int x = a[j]*10+a[k];
			int y = a[k]*10+a[j];
			if (suShu(x)&&suShu(y)&&x!=y) {
				s = s + x + ",";
			}
		}
		s = s.substring(0, s.length()-1);
		System.out.println(s);
	}
	public static boolean suShu(int i) {
		boolean f = true ;
		if (i==1) {
			f = false ;
		}else {
			for (int j = 2;j<=i/2;j++) {
				if (i%j==0) {
					f=false;
					break;
				}
			}
		}	
		return f ;
	}
}

Python :

import math
def sx(x):
    f=0
    for i in range(2,int(math.sqrt(x))):
        if x%i==0:
            f=1
    if f==0:
        return(True)
    else:
        return(False)
sr=input()
sr=sr[0:len(sr)-1]
s=""
for i in range(0,len(sr)-1):
    a1=int(sr[i])
    a2=int(sr[i+1])
    a=a1*10+a2
    b=a2*10+a1
    if sx(a)==True and sx(b)==True:
        s=s+str(a)+","
print(s[0:len(s)-1])