#include<iostream> using namespace std; main() { string s;cin>>s; int n=s.size(),cnt=0; for(int i=0;i<n/2;i++) { if(s[i]!=s[n-i-1])cnt++; } cout<<(cnt==1||cnt==0&&n%2==1?"YES":"NO")<<endl; }
#include<iostream> using namespace std; main() { string s;cin>>s; int n=s.size(),cnt=0; for(int i=0;i<n/2;i++) { if(s[i]!=s[n-i-1])cnt++; } cout<<(cnt==1||cnt==0&&n%2==1?"YES":"NO")<<endl; }