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

int fib(int count)
{
    if (count < 2) {
        return 1;
    }
    return fib(count - 1) + fib(count - 2);
}

char *fibstr(int n)
{
    char *x = (char*)malloc((fib(n) + 1) * sizeof(char));
    char *p = (char*)malloc((fib(n) + 1) * sizeof(char));
    char *pp = (char*)malloc((fib(n) + 1) * sizeof(char));
    pp[0] = 'a';
    p[0] = 'b';
    if (n == 1) {
        free(p);
        free(x);
        return pp;
    }
    if (n == 2) {
        free(pp);
        free(x);
        return p;
    }
    int i;
    for (i = 3; i < (n + 1); i++) {
        x[0] = 0;
        strcat(x, p);
        p[0] = 0;
        strcat(p, strcat(pp, x));
        pp[0] = 0;
        strcat(pp, x);
    }
    free(pp);
    free(x);
    return p;
}

int main()

{
    int n;
    scanf("%d", &n);
    char *res = fibstr(n);
    printf("%s", res);
    free(res);
	return 0;
}