#include <stdio.h>
FILE *infile;

void wrap()
{
  int n;
  char *buf=(char*)malloc(81);

  while (!feof(infile)) {
    fgets(buf, 80, infile);
    n=strlen(buf);
    if (n>78) {
      n--;
      while (buf[n]!=' ') {
        ungetc(buf[n--], infile);
      }
      buf[n]='\n';
      buf[n+1]='\0';
    }
  printf("%s", buf);
  }
  free(buf);
}

main(int argc, char *argv[])
{
  infile=fopen(argv[1], "r");

  wrap();

  fclose(infile);
}