#include <stdio.h>

void convert(long, char []);

void convert(long num, char str[]) {
  int minus = 0, i = 0, j = 0;
  char table[] = "0123456789";
  char tmp;

  if (num < 0) {
    minus = 1;
    num = -num;
  }
  do {
    str[j++] = table[num % 10]; /* 数値の下位から順に文字に変換 */
    num /= 10;
    i++;
    if (i % 3 == 0 && num != 0) {
      str[j++] = ',';
    }
  } while (num != 0);
  if (minus != 0) {
    str[j++] = '-';
  }
  str[j--] = '\0';
  for (i = 0; i < j; i++, j--) { /* 順序を逆にする。 */
    tmp = str[i];
    str[i] = str[j];
    str[j] = tmp;
  }
}

int main(void) {
  long nums[] = {1234567, -57482, 63, -999999};
  char str[BUFSIZ];
  int i, size = sizeof(nums) / sizeof(nums[0]);
  for (i = 0; i < size; i++) {
    convert(nums[i], str);
    printf("%s\n", str);
  }
  return 0;
}