#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int c = 0;
    for (int i = 0; i < n - 1; i++) {
      if (s[i] == '<' && s[i + 1] == '>') c++;
    }
    cout << c << "\n";
  }
}
