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

#define MAXS 10

char *str_cat( char *s, char *t )
{
	char *p,*q=t;
	for(p=s+strlen(s);*p,*q;p++,q++)
	{
		*p=*q;
	}
	return s;//返回字符串s的首地址
}

int main()
{
    char *p;
    char str1[MAXS+MAXS] = {'\0'}, str2[MAXS] = {'\0'};

    scanf("%s%s", str1, str2);
    p = str_cat(str1, str2);
    printf("%s\n%s\n", p, str1);

    return 0;
}