#include "stdio.h"
#include <string.h>
void catstr(char *des,char *sour)
{
	int end=strlen(des);
	int i=0;
	for(;i<strlen(sour);i++)
		des[end+i]=sour[i];
}
void main ()
{
	char s[]="Sit down";
	char t[]=" please.";
	catstr(s,t);
}