#include
#include
#include
int main(void) {
char line[1024];
char address[256];
char *ptr1 = NULL;
char *ptr2 = NULL;
while((fgets(line, 1024, stdin)) != NULL) {
if(strchr(line, '@') != NULL && strchr(line, '.') != NULL) {
for(ptr1 = line, ptr2 = address; *ptr1; ptr1++) {
if(isalpha(*ptr1) || isdigit(*ptr1) ||
strchr(".-_@", *ptr1) != NULL)
*ptr2++ = *ptr1;
else {
*ptr2 = '\0';
if(strlen(address) >= 6 && strchr(address, '@') != NULL &&
strchr(address, '.') != NULL)
printf("%s\n", address);
ptr2 = address;
} /* else */
} /* for */
} /* if */
} /* while */
return 0;
}