import java.util.*;
import java.lang.*;
 
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(encode(WWWWWWWWWBBBWWW));	
	}
	private static String encode(String input){
		char c='\0';
		char[] chars=input.charArray();
		String output="";int runLength=0;
		for(int i=0;i<chars.length;i++){
			if(c==chars[i]){
				runLength++;
			}else{
				output+=runLength+c;
				runLength=0;c='\0';
			}
		}
 
	}
	//private static String decode(String output){
	//}
}

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