#include<stdio.h>
#include<string.h>
int main() {
	int i = 0;
	int length = 0;
	int rem = 0;
	int count = 0;
	char line[13];
	scanf("%s",line);
	length = strlen(line);
	if(line[0] == '0') {
		printf("0");
		return (0);
	}
	if(length > 3) {
		if(length % 3 == 2) {
			printf("%c%c,", line[i], line[i + 1]);
			rem = 2;
		} else if(length % 3 == 1) {
			printf("%c,", line[i]);
			rem = 1;
		} else if(length % 3 == 0 && length == 3) {
			printf("%c%c%c,", line[i], line[i + 1], line[i + 2]);
			rem = 3;
		}
	}
	for(i = rem;i < length;i++) {
		count++;
		printf("%c",line[i]);
		if(count % 3 == 0 && i != length - 1)
			printf(",");
	}
	return (0);
}