/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/* 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
	{
		// your code goes here
		String line = "C3H20ZnO2ABCD";
      String pattern = "([A-Z][a-z]*)(((?=[A-Z][a-z]*|$))|\\d+)";
 
      // Create a Pattern object
      Pattern r = Pattern.compile(pattern);
 
      // Now create matcher object.
      Matcher m = r.matcher(line);
 
      while (m.find( )) {
          System.out.print(m.group(1));
         if (m.group(2).length() == 0) {
             System.out.println(" 1");
         } else {
             System.out.println(" " + m.group(2));
         }
      } 
	}
}

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