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//Author: Jigyasu #include <bits/stdc++.h> using namespace std; #define xlr8 ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL); #define ll long long #define endl "\n" #define vi vector<int> #define vs vector<string> #define vll vector<long long int> #define pb push_back #define mp make_pair #define F first #define S second #define all(a) a.begin(), a.end() #define gcd(a,b) __gcd(a,b) #define lcm(a,b) a*b/gcd(a,b) #define yes(check) (check) ? cout << "YES" << endl : cout << "NO" << endl #define rep(n) for(int i = 0; i < n; i++) bool checkAB(string s, int n){ for(int i = 0; i < n-1; i++){ if(s[i] == 'A' and s[i+1] == 'B') return false; } return true; } void solve(){ int n; cin >> n; string s; cin >> s; int count = 0; int i = 0; bool flag = false; while(true){ if(checkAB(s, n)) break; for(int i = 0; i < n-1; i++){ if(s[i] == 'A' and s[i+1] == 'B'){ count++; swap(s[i], s[i+1]); i++; if(i == n-1) flag = true; } } if(flag) break; } cout << count << endl; } signed main(){ xlr8; int tt; cin >> tt; while(tt--) solve(); return 0; }
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