import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        char ch[] = S.toCharArray();
        int N = S.length();
        int count = 0;
        for(int i = 0; i <= N/2-1; i++) {
        	if(ch[i] != ch[N-1-i]) {
        		count++;
        	}
        }
        System.out.println(count);
    
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz