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

struct freq {int ch;int count;struct freq * next;};

struct freq * fp;

incFreq(int ch)
{  struct freq * f;
   if(fp==NULL)
   {  fp = (struct freq *)malloc(sizeof(struct freq));
      fp ->ch = ch;
      fp->count = 1;
      fp->next = NULL;
      return;
   }
   f = fp;
   while(1)
    if(f->ch==ch)
    {  f->count = f->count+1;
       return;
    }
    else
    if(f->next==NULL)
    { f->next = (struct freq *)malloc(sizeof(struct freq));
      f->next->ch = ch;
      f->next->count = 1;
      return;
    }
    else
     f = f->next;
}

showFreq()
{  struct freq * f;
   f = fp;
   while(f!=NULL)
   {  printf("%c:%d, ",f->ch,f->count);
      f = f->next;
   }
   printf("\n");
}

main(int argc,char ** argv)
{  int ch;
   FILE * fin;
   if((fin=fopen(argv[1],"r"))==NULL)
   {  printf("can't open %s\n",argv[1]);
      exit(0);
   }
   fp = NULL;
   ch = getc(fin);
   while(ch!=EOF)
   {  incFreq(ch);
      ch = getc(fin);
   }
   fclose(fin);
   showFreq();
}