#include <stdio.h>
int letter,digit,space,others;
int main()
{void count(char []);
 char text[80];
 printf("input string:\n");
 gets(text);
 printf("string:");
 puts(text);
 letter=0;
 digit=0;
 space=0;
 others=0;
 count(text);
 printf("\nletter:%d\ndigit:%d\nspace:%d\nothers:%d\n",letter,digit,space,others);
 return 0;
}
 void count(char str[])
{
int i;
 for (i=0;str[i]!='\0';i++)
 if ((str[i]>='a'&& str[i]<='z')||(str[i]>='A' && str[i]<='Z'))
    letter++;
 else if (str[i]>='0' && str [i]<='9')
    digit++;
 else if (str[i]==32)
    space++;
 else
    others++;
}