//go:build !solution

package main

import (
	"bufio"
	"fmt"
	"os"
)

func LinesCountInFile(lines map[string]int, filename string) {
	file, err := os.Open(filename)
	if err != nil {
		return
	}
	defer file.Close()
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		line := scanner.Text()
		lines[line]++
	}
}

func main() {
	filenames, lines := os.Args[1:], make(map[string]int)
	for _, filename := range filenames {
		LinesCountInFile(lines, filename)
	}
	for line, count := range lines {
		if count != 1 {
			fmt.Printf("%v\t%v\n", count, line)
		}
	}
}