#define _GLIBCXX_DEBUG
// header {{{
#include <bits/stdc++.h>
using namespace std;
#define CPP_STR(x) CPP_STR_I(x)
#define CPP_CAT(x,y) CPP_CAT_I(x,y)
#define CPP_STR_I(args...) #args
#define CPP_CAT_I(x,y) x ## y
#define ASSERT(expr...) assert((expr))
using i8  = int8_t;
using u8  = uint8_t;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f32 = float;
using f64 = double;
using f80 = __float80;
// }}}
constexpr i64 INF = 1'010'000'000'000'000'017LL;
constexpr i64 MOD = 1'000'000'007LL;
constexpr f64 EPS = 1e-12;
constexpr f64 PI = 3.14159265358979323846;
// util {{{
#define FOR(i, start, end) for(i64 i = (start), CPP_CAT(i,xxxx_end)=(end); i < CPP_CAT(i,xxxx_end); ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(f,c,...) (([&](decltype((c)) cccc) { return (f)(std::begin(cccc), std::end(cccc), ## __VA_ARGS__); })(c))

template<typename C>
i64 SIZE(const C& c) { return static_cast<i64>(c.size()); }
template<typename T, size_t N>
i64 SIZE(const T (&)[N]) { return static_cast<i64>(N); }
template<typename T, typename U, typename Comp=less<>>
bool chmax(T& xmax, const U& x, Comp comp={}) {
    if(comp(xmax, x)) {
        xmax = x;
        return true;
    }
    return false;
}

template<typename T, typename U, typename Comp=less<>>
bool chmin(T& xmin, const U& x, Comp comp={}) {
    if(comp(x, xmin)) {
        xmin = x;
        return true;
    }
    return false;
}
// }}}

// init {{{
struct ProconInit {
    static constexpr int IOS_PREC = 15;
    static constexpr bool AUTOFLUSH = false;

    ProconInit() {
        cin.tie(nullptr);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(IOS_PREC);
        if(AUTOFLUSH)
            cout << unitbuf;
    }
} PROCON_INIT;
// }}}

//--------------------------------------------------------------------

signed main() {
    string s;
    cin>>s;
    int n = s.size()+1;
    vector<int> a(n,0);

    int counter = 0;
    for(int i=0;i<s.size();i++){
        char current = s.at(i);
        if(current == '<'){
            counter++;
            a.at(i+1) = counter;
        } else {
            counter = 0;
        }
    }

    counter = 0;
    for(int i=s.size()-1;i>=0;i--){
        char current = s.at(i);
        if(current == '>'){
            counter++;
            a.at(i) = max(a.at(i),counter);
        } else {
            counter = 0;
        }
    }
/*
    int counter = 0;
    char nowctng = 'x';
    REP(i,n){
        char current;
        if(i == n-1) current = 'a';
        else current = s.at(i);

        if(current == nowctng){
            counter++;
            a.at(i) = counter;
        } else {
            if(current == '<'){
                a.at(i) = 0;
            } else {
                a.at(i) = counter;
                a.at(i-counter) = max(a.at(i-counter),counter);
            }
            counter = 0;
            nowctng = current;
        }
    }
*/

    i64 sum = 0;
    REP(i,n){
       // cout<<a.at(i);
       // if(i != n-1) cout<<s.at(i);

        sum += a.at(i);
    }
    //cout<<endl;

    cout<<sum<<endl;

    // cout << ans << endl;
    return 0;
}

Measured memory_bytes: 2844