package asd;

import java.util.Scanner;

public class FUNC {

	public static String func(String str)
	{
		int i,k=0;
		StringBuilder sb = new StringBuilder();
		String newString = new String();
		for(i=0;i<str.length();i++)
		{
			if(str.charAt(i)>='a'&&str.charAt(i)<='z')
			{
				sb.insert(k, str.charAt(i));
				k++;
			}
		}
		newString = sb.toString();
		return newString;		
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String str=new String(),str2;
		Scanner input = new Scanner(System.in);
		System.out.print("Enter your string:");
		str=input.next();
		str2 = func(str);
		System.out.println(str2);
	}
}