package yukicoder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class yukicoder010 {
	public static void main(String[] args){
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String tes = null;
		
			try {
				tes = br.readLine();
			} catch (IOException e) {
				// TODO 自動生成された catch ブロック
				e.printStackTrace();
			}
			
			String tre;
			String poi;
			for(int i=1;i<tes.length();i++){
				tre = tes.substring(0, tes.length() - i);
				StringBuffer sb = new StringBuffer(tre);
		        sb.reverse();
		        StringBuffer sc = new StringBuffer(tre);
//		        System.out.println(i+":"+sb.toString());
//		        System.out.println(i+":"+sc.toString());
		        
		        
		        
				poi = tes.substring(tes.length() - i, tes.length());
				StringBuffer sb1 = new StringBuffer(poi);
		        sb.reverse();
		        StringBuffer sc1 = new StringBuffer(poi);
		        
		        
		        
		        if(sb.toString().equals(sc.toString()) && sb1.toString().equals(sc1.toString())){
		        	System.out.println(sb.length());
		        	System.exit(0);
		        }
			}
			
			
	}

}