#include <stdio.h>

int mystrlen(char *s)
{
  int n = 0;
  while (s[n]) n++;
  return n;
}

int mystrcpy(char *dest, char *fuente)
{
  while (*dest++ = *fuente++);
}

int main()
{
  char line[132];
  for (;;) {
    printf("¿? ");
    if (!fgets(line, sizeof line, stdin)) return 0;
    char *t = line;
    for (char *s = line; *s; s++) {
      // Is this character a duplicate of one we've already accepted?
      for (char *u = line; u < t; u++) {
        if (*s == *u) goto buenoestuprograma;
      }
      *t++ = *s;
      buenoestuprograma:;
    }
    *t = '\0';
    printf("%d: ¡%s!\n", mystrlen(line), line);
  }
}