/* Problem and solution written by Thomas Tang <ttang@cs.queensu.ca> */

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

#define TRUE 1
#define FALSE 0

void check(char *line, int p) 
{
    int d, i, j, start, stop, max;
    int prevIsDot;

    max = strlen(line);
    for (d = -1; d <= 1; d += 2) { /* forward and backward */
	prevIsDot = FALSE;
	for (i = p+d; (0 <= i) && (i < max); i += d) {
	    if (isalnum(line[i]) || (line[i] == '_')) {
		prevIsDot = FALSE;
	    } else {
		if (line[i] == '.') {
		    if (prevIsDot) break;
		    prevIsDot = TRUE;
		} else {
		    break;
		}
	    }
	}
	i -= d; /* back track one step */
	if (line[i] == '.') i -= d;  /* back track one more step */
	if (d == -1) {
	    start = i;
	}  else {
	    stop = i;
	}
    }
    if ((p-start == 0) || (stop-p == 0)) return;
    for (i = start; i <= stop; i++) {
	printf("%c", line[i]);
	line[i] = ' ';
    }
    printf("\n");
}


main() 
{
    char line[100];
    int i, j, k;

    for (;;) {
	gets(line);
	if (strcmp(line, "EOF") == 0) break;
	for (i = 0; i < strlen(line); i++) {
	    if (line[i] == '@') {
		check(line, i);
	    }
	}
    }
}