/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String str = "nneoosftt";
 
 
        for(int i=0;i<str.length();i++){
 
            char temp = str.charAt(i);
 
            int count =0;
            for(int j=0;j<str.length();j++){
                if(temp==str.charAt(j))
                    count++;
            }
            if(count==1)
                System.out.println(temp);
 
        }
	}
}

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