#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Yukicoder №784 「,（カンマ）」 ★
// https://yukicoder.me/problems/no/784
// ***********************
#define	str_len(a)	mystr_len_lim(a,9999)
static int mystr_len_lim(char *str,int lim){int i=0;do{if(str[i]=='\0')break;i++;}while(i<lim);return i;}
#define GETLINE(str)	do{char *p;fgets(str,sizeof(str),stdin);p=strchr(str,'\n');if(p)*p='\0';}while(0)
static int GETLINEINT(void) {char s[34];GETLINE(s);return atoi(s);}

// *********************
// *********************
char *COMMA(int inum ) {
	static char ostr[128];
	static char tmp[128];
	int	minf = 1;
	int	lnk = -1;
	char	*ip;
	char	*op;

	op = &ostr[128-1];
	if( inum < 0 ) {
		minf = -1;
		inum = inum * -1;
	}
	sprintf(tmp,"%d",inum);
	ip = &tmp[ str_len( tmp ) -1 ];
	*(op)-- = '\0';
	// start
	while( ip >= tmp ) {
		if( ++lnk >= 3 ) {
			*(op)-- = ',';
			lnk = 0;
		}
		*(op)-- = *(ip)--;
	}
	++(op);
	if( minf < 0 ) {
		*--(op) = '-';
	}
	return op;
}
// *********************
int main( void ) {
	int	i;

	i = GETLINEINT();
	printf("%s\n",COMMA(i));
}