import java.io.*;
import java.util.Locale;
import java.util.StringTokenizer;

public class ssau implements Runnable {

final boolean ONLINE_JUDGE = System.getProperty("ONLINE_JUDGE") != null;

BufferedReader in;
PrintWriter out;
StringTokenizer tok = new StringTokenizer("");

public static void main(String[] args) {
new Thread(null, new ssau(), "", 128 * (1L << 20)).start();

}

void init() throws FileNotFoundException {
Locale.setDefault(Locale.US);

if (ONLINE_JUDGE) {
in = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
} else {
in = new BufferedReader(new FileReader("input.txt"));
out = new PrintWriter("output.txt");
}
}

long timeBegin, timeEnd;

void time() {
timeEnd = System.currentTimeMillis();
System.err.println("Time = " + (timeEnd - timeBegin));
}

public void run() {
try {
timeBegin = System.currentTimeMillis();

init();
solve();

out.close();
time();
} catch (Exception e) {
e.printStackTrace(System.err);
System.exit(-1);
}
}


String readString() throws IOException {

while (!tok.hasMoreTokens()) {
try {
tok = new StringTokenizer(in.readLine());
} catch (Exception e) {
return null;
}
}
return tok.nextToken();
}

String readString(String s) throws IOException {
while (!tok.hasMoreTokens()) {
try {
tok = new StringTokenizer(in.readLine(), s + "\n \t");
} catch (Exception e) {
return null;
}
}
return tok.nextToken();
}

int readInt() throws IOException {
return Integer.parseInt(readString());
}

int readInt(String s) throws IOException {
return Integer.parseInt(readString(s));
}

void solve() throws IOException {
    int n = readInt();
    char[] a = readString().toCharArray();
    String ress="";
    char[] res = new char[5000];
    for(int i=0;i<26;i++)
    {
        res[0]=(char) ('a' + i);
        for(int j=0;j<res.length-1;j++ ){
        if(a[j] == '>'  ){
            if((char) (res[j]+1)<'z')
            break;
            else
            {
            res[j+1] = (char)(res[j] + 1);
            }
        }
        if(a[j] == '<' ){
            if(((char) (res[j]-1)<'a'))
            break;
            else
            {
            res[j+1] = (char)(res[j] -1);
            }
        }
        if(a[j] == '=' ){
            res[j+1] = (char)(res[j]);
        }
        }
    }

}
}