#include <iostream>
#include <algorithm>
#include <string>
#include <cmath>
#include <vector>
#include <fstream>
#include <utility>
#include <stdio.h>
#include <map>

using namespace std;

    map<char,int>m;
    vector<int>sh;
    string s;

int main()
{
    //freopen("input.txt" , "r" , stdin);
    //freopen("output.txt" , "w" , stdout);
    freopen("locker.in" , "r" , stdin);
    freopen("locker.out" , "w" , stdout);
    if (s.size()==1)
    {
        cout<<"YES";
        return 0;
    }
    cin>>s;
    for (int i=0; i<s.size(); i++)
    {
        m[s[i]]++;
    }
    int kc=0;
    for (int i = 0; i<s.size(); i++)
    {
        if (m[s[i]]%2==1)
        {
            kc++;
            m[s[i]]=0;
        }
    }
    for (int i=0; i<s.size(); i++)
    {
        m[s[i]]++;
    }
    if (s.size()%2==0 && kc>0)
    {
        cout<<"NO";
        return 0;
    }
    if (s.size()%2==1 && kc>1 && m[s[s.size()/2]]%2!=0)
    {
        cout<<"NO";
        return 0;
    }
    int n=s.size()/2;
    if (s.size()%2==0)
        n--;
    for (int i=0; i<=n; i++)
    {
        if (s[i]!=s[s.size()-i-1])
            sh.push_back(i);
    }
    if (sh.size()<=2)
    {
        swap(s[sh[0]],s[sh[1]]);
        if (s[sh[0]]==s[s.size()-sh[0]-1] && s[sh[1]]==s[s.size()-sh[1]-1])
            cout<<"YES";
        else cout<<"NO";
    }
    else cout<<"NO";
    return 0;
}