---

package main

import (
	"os"

	"github.com/01-edu/z01"
)

func main() {
	if len(os.Args) != 3 {
		return
	}

	first := os.Args[1]
	second := os.Args[2]

	for i := 0; i < len(first); i++ {
		found := false

		for j := 0; j < len(second); j++ {
			if first[i] == second[j] {
				found = true
				break
			}
		}

		if found {
			already := false

			for k := 0; k < i; k++ {
				if first[i] == first[k] {
					already = true
					break
				}
			}

			if !already {
				z01.PrintRune(rune(first[i]))
			}
		}
	}

	z01.PrintRune('\n')
}