Given is a string S of length N-1. Each character in S is `<` or `>`.

A sequence of N non-negative integers, a_1,a_2,\cdots,a_N, is said to be good when the following condition is satisfied for all i (1 \leq i \leq N-1):

* If S_i= `<`: a_i<a_{i+1}
* If S_i= `>`: a_i>a_{i+1}



Find the minimum possible sum of the elements of a good sequence of N non-negative integers.

Constraints

* 2 \leq N \leq 5 \times 10^5
* S is a string of length N-1 consisting of `<` and `>`.

Input

Input is given from Standard Input in the following format:


S


Output

Find the minimum possible sum of the elements of a good sequence of N non-negative integers.

Examples

Input

<>>


Output

3


Input

<>>><<><<<<<>>><


Output

28
#include <bits/stdc++.h>
using namespace std;

int main() {
    string S;
    cin >> S;
    int N = S.size();
    vector<int> a(N + 1, 0);
    for (int i = 0; i < N; ++i) {
        if (S[i] == '<') a[i+1] = max(a[i+1], a[i] + 1);
    }
    for (int i = N-1; i >= 0; --i) {
        if (S[i] == '>') a[i] = max(a[i], a[i+1] + 1);
    }
    long long res = 0;
    for (int i = 0; i < N+1; ++i) res += a[i];
    cout << res << endl;
}