using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var S = sc.ReadStr();
        if (S[0] == '>') S = S[0] + S;
        var rle = RLE(S).ToArray();
        long ans = 0;
        for (int i = 0; i < rle.Length; i++)
        {
            var t = rle[i];
            if (t.Item1 == '<')
            {
                for (int j = 1; j <= t.Item2; j++)
                {
                    ans += j;
                }
                if (i < rle.Length - 1)
                {
                    ans += Math.Max(0, rle[i + 1].Item2 - t.Item2);
                }
            }
            else
            {
                for (int j = 0; j < t.Item2; j++)
                {
                    ans += j;
                }
            }
        }
        Console.WriteLine(ans);
    }

    static IEnumerable<Tuple<char, int>> RLE(string s)
    {
        var count = 1;
        var c = s[0];
        for (int i = 1; i < s.Length; i++)
        {
            if (c == s[i])
            {
                count++;
            }
            else
            {
                yield return Tuple.Create(c, count);
                count = 1;
            }
            c = s[i];
        }
        yield return Tuple.Create(c, count);
    }

    static Scanner sc = new Scanner();
}

class Scanner
{
    string[] S = new string[0];
    int Index = 0;
    char[] Separators = new char[] { ' ' };

    public string Next()
    {
        if (this.Index < this.S.Length) return this.S[this.Index++];
        var line = "";
        while (line == "") line = Console.ReadLine();
        this.S = line.Split(this.Separators, StringSplitOptions.RemoveEmptyEntries);
        if (this.S.Length == 0) return this.Next();
        this.Index = 0;
        return this.S[this.Index++];
    }
    public string ReadStr()
    {
        return this.Next();
    }
    public char ReadChar()
    {
        return this.Next()[0];
    }
    public int ReadInt()
    {
        return int.Parse(this.Next());
    }
    public uint ReadUInt()
    {
        return uint.Parse(this.Next());
    }
    public long ReadLong()
    {
        return long.Parse(this.Next());
    }
    public double ReadDouble()
    {
        return double.Parse(this.Next());
    }
    public int[] ReadIntArray(int n)
    {
        var array = new int[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadInt();
        }
        return array;
    }
    public long[] ReadLongArray(int n)
    {
        var array = new long[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadLong();
        }
        return array;
    }
    public double[] ReadDoubleArray(int n)
    {
        var array = new double[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadDouble();
        }
        return array;
    }
    public char[] ReadCharArray(int n)
    {
        var array = new char[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadChar();
        }
        return array;
    }
    public string[] ReadStrArray(int n)
    {
        var array = new string[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadStr();
        }
        return array;
    }
}


Measured memory_bytes: 26204