using Yorukatsu027.Questions;
using Yorukatsu027.Extensions;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml.Schema;

namespace Yorukatsu027.Questions
{
    public class QuestionC : AtCoderQuestionBase
    {
        /// <summary>
        /// ABC098 C
        /// </summary>
        /// <param name="inputStream"></param>
        /// <returns></returns>
        public override IEnumerable<object> Solve(TextReader inputStream)
        {
            var n = inputStream.ReadInt();
            var s = inputStream.ReadLine();

            var east = new int[s.Length + 2];
            var west = new int[s.Length + 2];

            for (int i = 0; i < s.Length; i++)
            {
                if (s[i] == 'W')
                {
                    west[i + 1] = west[i] + 1;
                }
                else
                {
                    west[i + 1] = west[i];
                }
            }

            for (int i = s.Length - 1; i >= 0; i--)
            {
                if (s[i] == 'E')
                {
                    east[i + 1] = east[i + 2] + 1;
                }
                else
                {
                    east[i + 1] = east[i + 2];
                }
            }

            var min = int.MaxValue;
            for (int i = 1; i <= s.Length; i++)
            {
                min = Math.Min(min, west[i - 1] + east[i + 1]);
            }

            yield return min;
        }
    }
}


namespace Yorukatsu027
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionC();    // 問題に合わせて書き換え
            var answers = question.Solve(Console.In);
            foreach (var answer in answers)
            {
                Console.WriteLine(answer);
            }
        }
    }
}

#region Base Classes

namespace Yorukatsu027.Questions
{

    public interface IAtCoderQuestion
    {
        IEnumerable<object> Solve(string input);
        IEnumerable<object> Solve(TextReader inputStream);
    }

    public abstract class AtCoderQuestionBase : IAtCoderQuestion
    {
        public IEnumerable<object> Solve(string input)
        {
            var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
            var reader = new StreamReader(stream, Encoding.Unicode);

            return Solve(reader);
        }

        public abstract IEnumerable<object> Solve(TextReader inputStream);
    }

}

#endregion

#region Extensions

namespace Yorukatsu027.Extensions
{
    internal static class TextReaderExtensions
    {
        internal static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
        internal static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
        internal static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
        internal static string ReadString(this TextReader reader) => reader.ReadLine();

        internal static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
        internal static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
        internal static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
        internal static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);
    }
}

#endregion

Measured memory_bytes: 14432