#include <iostream>
#include <string>
using namespace std;

int main() {
	string f1 = "a";
	string f2 = "b";
	string res = "";

	for(int i = 0;i<10;i++){
		res = f1+f2;
		f1 = f2;
		f2 = res;
		cout << res << endl;
	}
	return 0;
}


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


using namespace std;

int main()
{
	char f1[100];
	char f2[100];
	char res[100];
	char suma[100];

	strcpy(f1,"a");
	strcpy(f2,"b");
	strcpy(res,"");

	strcat(res,f2);

	cout << res;

	/*
	for(int i = 0;i<10;i++){
		res = f1+f2;
		f1 = f2;
		f2 = res;
		cout << res << endl;
	}
	*/

	for(int i = 0;i<10;i++){
		strcpy
	}
}

/*
int main ()
{
  char str1[]="Sample string";
  char str2[40];
  char str3[40];
  strcpy (str2,str1);
  strcpy (str3,"copy successful");
  printf ("str1: %s\nstr2: %s\nstr3: %s\n",str1,str2,str3);
  return 0;
}
*/