package main

import (
	"fmt"
	"log"
	"os"
	"strings"
)

func readNumbers(startingNumbers string) (int, map[int][2]int) {
	lastNumber := 0
	numbersSpoken := make(map[int][2]int)
	for i, item := range strings.Split(string(startingNumbers), ",") {
		var number int
		n, err := fmt.Sscanf(item, "%d", &number)
		if err != nil || n < 1 {
			log.Fatal(err)
		}

		lastNumber = number
		numbersSpoken[number] = [2]int{i + 1, 0}
	}

	return lastNumber, numbersSpoken
}