#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll mod=1000000007999;
ld inf=10000999999999900;
int main(){
    ll t;
    cin >> t;
    vector<ll>ans;
    for (ll o = 0; o < t; o++)
    {
        ll n;
        cin >> n;
        string s;
        cin >> s;
        vector<ll>ten(n+100,1);
        for (ll i = 1; i < ten.size(); i++)
        {
            ten[i]=ten[i-1]*997;
            ten[i]%=mod;
        }
        vector<ll>hs(n);
        hs[0]=s[0]-'a';
        for (ll i = 1; i <n; i++)
        {
            hs[i]=hs[i-1]*997;
            hs[i]+=(s[i]-'a');
            hs[i]%=mod;
        }
        ll x=0;
        for (ll i = 1; i*2 < n; i++)
        {
            ll y=hs[i-1];
            ll z=hs[i*2-1];
            z+=mod-(hs[i-1]*ten[i])%mod;
            z%=mod;
            if (y==z)
            {
                x++;
            }
        }
        for (ll i = 1; i < n; i++)
        {
            if (s[i]>s[0])
            {
                x++;
            }
        }
        ans.push_back(x);
    }
    for (ll i = 0; i < ans.size(); i++)
    {
        cout << ans[i] << endl;
    }
    
}