View Code of Problem 43

#include<stdio.h>
int main()
{
	char a[100];
	int i;	//a组指针
	gets(a);
	for(i=0;a[i]!='\0';i++)
	{
		if((a[i]>=65&&a[i]<=90)||(a[i]>=97&&a[i]<=122))
		putchar(a[i]);
	}
	printf("\n");
	return 0;
}