#include <bits/stdc++.h>
using namespace std;
 
#define fast_io ios::sync_with_stdio(false); cin.tie(NULL)
#define int long long
 
void solve() {
    string s;
    cin >> s;
    int n = s.size();
 
    if (s[0] != '<' || s[n-1] != '>') {
        cout << -1 << "\n";
        return;
    }
 
    int pref = 0;
    while (pref < n && s[pref] == '>') pref++;
 
    int suf = 0;
    while (suf < n && s[n-1-suf] == '<') suf++;
 
    cout << max(pref, suf) << "\n";
}
 
int32_t main() {
    fast_io;
    int t;
    cin >> t;
    while (t--) solve();
    return 0;
}
 

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NAoqKioqKgombHQ7Jmx0OyZsdDsmZ3Q7CiZndDsqJmx0OwoqCg==

4
*****
<<<>
>*<
*