#include <stdio.h>
#include <string.h>
#include <stdbool.h>
void main(void){
	char eMail[1000000] = "a";
	scanf("%s",eMail);
	bool atSignFlg = false;
	for(int i = 0 ; i < (int)strlen(eMail);i++){
		if(!atSignFlg){
			if(eMail[i] != '('){
				printf("%c",eMail[i]);
			}else{
				atSignFlg = true;
			}
		}else{
			if(eMail[i] == ')'){
				atSignFlg == false;
				printf("@");
				continue;
			}
		}
	}
}