#include <string>
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
 
int main() {
    int t;
    cin>>t;
    for(int k=1;k<=t;++k)
    {
        string s;
        cin>>s;
        int ans=0;
        for(int i=0;i<s.size()/2;++i)
            ans=ans+abs(s[i]-s[s.size()-i-1]);
        cout<<ans<<endl;
 
    }
    return 0;
}