B - Atilla's Favorite Problem.cpp

#include <bits/stdc++.h>

using namespace std;

int main(){
    cin.tie(nullptr), ios::sync_with_stdio(false);
    int t, n;
    string s;
    cin >> t;
    while(t--){
        cin >> n >> s;
        int ans = 0;
        for(char c : s) ans = max(ans, c - 'a' + 1);
        cout <<ans << "\n";
    }
}