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#include <stdio.h>
#include <ctype.h>
#include <string.h>
void characteronly(char *,int);
int main()
{	char s[100];
	char c;
	int i;
	c=getchar();
	while(c!='\n')
	{
		s[i]=c;
		i++;
		c=getchar();
	}
	s[i]='\0';
	characteronly(s,i);
	puts(s);
	return 0;

}
void  characteronly(char *s,int n)
{	int j,i;
	for (i=0,j=0;i<n;i++)
        {       if (isalpha(s[i]))
                {       s[j]=s[i];
                        j++;
                }

        }
	s[j]='\0';
}