#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

char randascii() {
  while (true) {
    char r = rand() & 0x7f;
    if (r >= 0x20 && r <= 0x7e) {
      return r;
    }
  }
}

int main(int argc, char **argv) {
  char last = 0x1f;
  int skips = 0;
  int line_len = 0;

  while (true) {
    char c = randascii();
    putchar(c);
    if (c == last + 1 && skips++ == 10) {
      last = c;
      if (line_len++ == 15) {
        putchar('\n');
        line_len = 0;
      }
      if (c == 0x7e) {
        break;
      }
      skips = 0;
    } else {
      putchar('\b');
    }
    usleep(200);
  }

  putchar('\n');
}