#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void)
{
    FILE *fp;
    char str[128];
    if ((fp=fopen("input.txt","r"))==NULL)
     {
       printf("Error\n");
       exit(1);
     }
    while(!feof(fp))
    {
      fgets(str, 126, fp);
      if (strstr(str,"hellow")!=NULL)
       printf("%s", str);
    }
    fclose(fp);

    return 0;
}