package main

import (
	"bufio"
	"log"
	"math"
	"os"
)

// readlines reads lines from stdin.
// Then it returns them as an array of strings
func readlines() []string {
	lines := []string{}

	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}

	return lines
}

// compare returns the number of matching elements
func compare(a []string, b []string) (int, error) {
	n := 0
	for _, elem := range a {
		if contains(b, elem) {
			n += 1
		}
	}
	return n, nil
}

// contains returns true if a slice of elements contains a given element
func contains[T comparable](elems []T, v T) bool {
	for _, s := range elems {
		if v == s {
			return true
		}
	}
	return false
}

// pow returns the value of x to the n
func pow(x, n int) int {
	return int(math.Pow(float64(x), float64(n)))
}