#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int is_valid_char( char c) {
  if (c>='a' && c<='z') return 1;
  if (c>='A' && c<='Z') return 1;
  if (c>='0' && c<='9') return 1;
  if (c == '-') return 1;
  if (c == '_') return 1;
  return 0;
}

int stripemail( char *buffer, char *email) {
  int i, j, k, l;

  for (i=0; i<strlen(buffer); i++) {
    if (buffer[i] == '@') {
      break;
    }
  }
  if (i>=(strlen(buffer)-1)) {
    return -1;
  }

  for (j=i-1; j>0; j--) {
    if (!is_valid_char( buffer[j])) {
      j++;
      break;
    }
  }

  for (k=i+1; k<strlen(buffer); k++) {
    if (!is_valid_char( buffer[k])) {
      k--;
      break;
    }
  }

  for (l=j;l<=k;l++) {
    email[ l-j] = buffer[l];
  }
  email[l-j] = 0;
  return 0;
}


int main() {
  char *buffer = (char*)malloc( 0x10000);
  char *email  = (char*)malloc( 0x10000);
  int retval; 
  while (gets( buffer)) {
    if (stripemail( buffer, email)) { 
      continue;
    }
    printf( "%s\n", email);
  }
  free( email);
  free( buffer);
  return 0;
}