/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.Scanner;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
// your code goes here
int n1,n2,temp,flag;
Scanner sc
=new Scanner
(System.
in); n1=sc.nextInt();
n2=sc.nextInt();
if(n1>n2)
{
temp=n1;
n1=n2;
n2=temp;
}
System.
out.
println("prime b"+n1
" "+n2
"); while(n1<n2)
{
flag=0;
for(i=2;i<n1%2;i++)
{
if(n1%1==0)
{
flag==1;
break;
}
}
if(flag==0)
{
System.out.println(n1);
n1++;
}
}
}
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