// No.2041 E-mail Address
package main

import (
	"fmt"
	"strings"
)

func main() {
	var s string
	fmt.Scan(&s)

	s1, s2, _ := strings.Cut(s, "(")
	_, ss2, _ := strings.Cut(s2, ")")
	fmt.Println(s1 + "@" + ss2)
}