这是我代码：
#include <stdio.h>
#include <string.h>
int main()
{
    char a[1000000];
    int count,len,i;
    //freopen("in.txt","r",stdin);
    while(gets(a) != NULL)
    {
      count=0;
      len=strlen(a);
      a[len+1]='\0';
      for(i=0; i<=len; i++)
      {
          if(a[i]>='A' && a[i]<='Z')
             a[i]+=32;
          if((a[i]>='a' && a[i]<='z') && (a[i+1]<'a' || a[i+1]>'z'))
            count++;
      }
      printf("%d\n",count);
    }
    return 0;
}
真心求解，谢~

统计单词个数，这是uva上给的样例：
Sample Input

Meep Meep!
I tot I taw a putty tat.
I did! I did! I did taw a putty tat.
Shsssssssssh ... I am hunting wabbits. Heh Heh Heh Heh ...

Sample Output

2
7
10
9

那我这样做哪错了？