问题九十二：字符统计

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

int main()
{
		long a;
		long b;
		long c;
		long d;
		long i;
		long k;

		char n[100000];

		while(gets(n) !=NULL)
		{
			a=b=c=d=0;
			k=strlen(n);

			for(i=0; i<k; i++)
			{
			  if( (n[i]>='a' && n[i]<='z') || (n[i]>='A' && n[i]<='Z') )
					a++;
			  else if(n[i]>='0' &&n [i]<='9')
					b++;
			  else if(n[i]==' ')
					c++;
			  else 
				    d++;
			}
			printf("%ld %ld %ld %ld\n", a, b, c, d);
		}    

        return 0

}