import java.io.*;
import java.util.*;
import java.math.*;
import java.lang.*;
 
import static java.lang.Math.*;

public class Main implements Runnable {
    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;
        private BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        public InputReader(InputStream stream) {
            this.stream = stream;
        }
        
        public int read() {
            if (numChars==-1) 
                throw new InputMismatchException();
            
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                }
                catch (IOException e) {
                    throw new InputMismatchException();
                }
                
                if(numChars <= 0)               
                    return -1;
            }
            return buf[curChar++];
        }
     
        public String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
        public int nextInt() {
            int c = read();
            
            while(isSpaceChar(c)) 
                c = read();
            
            int sgn = 1;
            
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            
            int res = 0;
            do {
                if(c<'0'||c>'9') 
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c)); 
            
            return res * sgn;
        }
        
        public long nextLong() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            long res = 0;
            
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
                return res * sgn;
        }
        
        public double nextDouble() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            double res = 0;
            while (!isSpaceChar(c) && c != '.') {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, nextInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            if (c == '.') {
                c = read();
                double m = 1;
                while (!isSpaceChar(c)) {
                    if (c == 'e' || c == 'E')
                        return res * Math.pow(10, nextInt());
                    if (c < '0' || c > '9')
                        throw new InputMismatchException();
                    m /= 10;
                    res += (c - '0') * m;
                    c = read();
                }
            }
            return res * sgn;
        }
        
        public String readString() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } 
            while (!isSpaceChar(c));
            
            return res.toString();
        }
     
        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
     
        public String next() {
            return readString();
        }
        
        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }
    public static void main(String args[]) throws Exception {
        new Thread(null, new Main(),"Main",1<<26).start();
    }
    public void run() {
        InputReader sc = new InputReader(System.in);
        PrintWriter w = new PrintWriter(System.out);

        int t=sc.nextInt();
        for(int z=0;z<t;z++){
            int n=sc.nextInt();
            String s=sc.next();
            
            ArrayList<Character> al1 =new ArrayList<Character>();
            ArrayList<Character> al2 =new ArrayList<Character>();
            int k=0;
            char prev='.';
            for(int i=n-1;i>=0;i--){
               if(i==n-1){
                   al1.add(s.charAt(i));
                   prev=s.charAt(i);
               }
               else{
                   if(s.charAt(i)=='>' && prev=='<'){
                       continue;
                   }
                   if(s.charAt(i)=='<'){
                       al1.add(s.charAt(i));
                       prev='<';
                       continue;
                   }
                   if(s.charAt(i)=='>' && prev=='>'){
                       al1.add(s.charAt(i));
                       prev='>';
                   }
               }
            }
            int c1=0; int c2=0;
            for(int j=0;j<al1.size();j++){
                if(al1.get(j)=='<') c1++;
                else c2++;
            }
            
            int rem1=c2;
            
            for(int i=0;i<n;i++){
                if(i==0){
                    al2.add(s.charAt(i));
                    prev=s.charAt(i);
                    continue;
                }
                else{
                    if(s.charAt(i)=='<' && prev=='>'){
                        continue;
                    }
                    if(s.charAt(i)=='>'){
                        al2.add(s.charAt(i));
                        continue;
                    }
                    if(s.charAt(i)=='<' && prev=='<'){
                        al2.add(s.charAt(i));
                        prev='<';
                        continue;
                    }
                }
            }
            
            c1=0;c2=0;
            
            for(int j=0;j<al2.size();j++){
                if(al2.get(j)=='>') c1++;
                else c2++;
            }
            
            int rem2=c2;
            
            int rem=Math.min(rem1,rem2);
            w.println(rem);
            
        }


        w.close();
    }
}