import java.util.Scanner;

public class A_Mod {

    public static boolean verificar_pal(String str) {
        int i, c;
        c = 0;
        for (i = 0; i < str.length()/2; i++){
            if (str.charAt(i) != str.charAt(str.length()-i-1)){
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner ler = new Scanner(System.in);
        int c;
        String str;
        c = 0;
        str = ler.next();
        while (!verificar_pal(str)){
            str = ler.next();
            c++;
        }
        System.out.println(c);
    }
}