/* package whatever; // don't place package name! */
 
import java.util.*;
import java.util.stream.*;
import java.util.stream.Collectors.*;
import java.util.regex.*;
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
	{
	    List<String> data = Arrays.asList( "a", "12", "b", "34", "c", "38", "d", "21", "19", "1" );
	    Map<Character,Integer> digCount = data.stream()
	        .filter(Pattern.compile("\\d+").asPredicate())
	        .collect(Collectors.groupingBy(s -> s.charAt(0), Collectors.summingInt(s->1)));
	    for (Map.Entry<Character,Integer> e : digCount.entrySet()) {
	    	System.out.println(e.getKey()+" "+e.getValue());
	    }
	}
}

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