#include <stdio.h>
int hmstosec(const char *hms) {
  int h, m, s;
  return sscanf(hms, "%d:%d:%d", &h, &m, &s) == 3 ? h * 3600 + m * 60 + s : 0;
}
char *sectohms(char *buff, int sec) {
  sprintf(buff, "%02d:%02d:%02d", sec % 86400 / 3600, sec % 3600 / 60, sec % 60);
  return buff;
}
char *f(char *buff, const char *hms) {
  return sectohms(buff,  hmstosec(hms) + 1);
}
int main() {
  char buff[32];
  printf("%s\n", f(buff, "00:00:00"));
  printf("%s\n", f(buff, "23:59:59"));
  return 0;
}
 

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