You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: timetravel-1010.go
    path of file: ./repos/retos-programacion-2023/Retos/Reto #30 - EL TECLADO T9 [Media]/go
    
    the code of the file until where you have to start completion: package main

import (
	"fmt"
	"strings"
)

var keyboard = map[string][]string{
	"1": {",", ".", "?", "!"},
	"2": {"A", "B", "C"},
	"3": {"D", "E", "F"},
	"4": {"G", "H", "I"},
	"5": {"J", "K", "L"},
	"6": {"M", "N", "O"},
	"7": {"P", "Q", "R", "S"},
	"8": {"T", "U", "V"},
	"9": {"W", "X", "Y", "Z"},
	"0": {" "},
}

func read_input(
    
func read_input(input string) string {
	numbers := strings.Split(input, "-")
	output := ""
	counter := 0

	for _, c := range numbers {
		if len(c) > 1 {
			for _, cc := range c { // Para numeros repetidos.
				counter++
				if counter > len(keyboard[string(cc)]) { // Para evitar error con cosas como 6666
					counter = 1
				}
			}
			counter--
			c = string(c[0])
		}
		output += keyboard[c][counter]
		counter = 0
	}
	return output
}