
import java.util.*; 
  
class GFG 
{ 
  
 
static void change(String s) 
{ 
  
     
    int n = s.length();  
  
     
    int cc = 0; 
  
    for(int i = 0; i < n/2; i++) 
    { 
  
         
        if(s.charAt(i) == s.charAt(n - i - 1))  
            continue; 
  
          
        cc += 1; 
  
         
        if(s.charAt(i) < s.charAt(n - i - 1))  
            s = s.replace(s.charAt(n - i - 1),s.charAt(i)); 
        else
            s = s.replace(s.charAt(n),s.charAt(n - i - 1)); 
    } 
    System.out.println("Minimum characters to be replaced = "+(cc)) ; 
    System.out.println(s);  
} 