import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import acm.program.ConsoleProgram;

public class Symbol_Statistics extends ConsoleProgram {
    public void run() {
        HashMap<String, ArrayList<String>> map = new HashMap<>();
        while (true) {
            String names = readLine("Enter pair: ");
            if ("".equals(names)) {
                break;
            }
            String name1 = names.substring(0, names.indexOf(" "));
            String name2 = names.substring(names.indexOf(" ") + 1);
            if (!map.containsKey(name1)) {
                map.put(name1, new ArrayList<String>());
            }
            // map.get(name1).add(name2);
            ArrayList<String> arr = map.get(name1);
            arr.add(name2);

        }
    }
}