作者 郭聪
#include<stdio.h>
#include<string.h>
int main()
{
int i=0;
char str[100];
scanf("%s",str);
while(str[i]!='\0')
{
if(str[i]>='a'&&str[i]<='z'||str[i]>='A'&&str[i]<='Z'||str[i]>='0'&&str[i]<='9')
printf("%c",str[i]);
else
{if(str[i+1]>='a'&&str[i+1]<='z'||str[i+1]>='A'&&str[i+1]<='Z'||str[i+1]>='0'&&str[i+1]<='9')
printf("\n");
}
i++;}
return 0;
}