cf 805B

/* The answer is constructive as follows:

            "aabbaabbaabb..."*/

#include<stdio.h>

int main()
{
    int n, i;
    scanf("%d", &n);

    if(n == 1) printf("a\n");
    else if(n == 2) printf("ab\n");
    else if(n == 3) printf("bba\n");
    else if(n % 4 == 0)
    {
        for(i = 0; i < n / 4; i++)
        {
            printf("aabb");
        }
        printf("\n");
    }
    else if(n % 4 == 1)
    {
        for(i = 0; i < n / 4; i++)
        {
            printf("aabb");
        }
        printf("a\n");
    }
    else if(n % 4 == 2)
    {
        for(i = 0; i < n / 4; i++)
        {
            printf("aabb");
        }
        printf("aa\n");
    }
    else if(n % 4 == 3)
    {
        for(i = 0; i < n / 4; i++)
        {
            printf("aabb");
        }
        printf("aab\n");
    }

}