#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, ans;
  cin >> n;
  for (int i = 0; i < n; i++) {
    string s;
    int m;
    cin >> m >> s;
    ans = min(s.find(">"), m - (s.rfind("<") - 1));
    cout << ans << "\n";
  }
}
