char* nadovezi(char S1[],char S2[]){
	int i=0,p=strlen(S1),m=strlen(S2);
	char *SR;
	SR = (char *)calloc(p+m,sizeof(char));
	strncpy(SR,S1,p);
	while(i<=m)
		SR[p+i] = S2[i++];

	strcpy(S1,SR);
	return S1;
}

void main() {
    char A[2001],B[2001];
	gets(A);gets(B);
	printf("\n");
	puts(A);puts(B);
	nadovezi(A,B);
	printf("\n");
	puts(A);
}