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#include <cstdio>
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
 
int main()
{
    int n, diff=0;
    char c;
    scanf("%d",&n);
    scanf("%c",&c);
    for (int i=0; i<8*n; i++)
    {
        scanf("%c",&c);
        if (c == '0')
            diff--;
        else
            diff++;
    }

    if (diff < -2*n || diff > 4*n)
        printf("NIE\n");
    else
    {
        for (int i=0; i<n; i++)
        {
            if (diff < 0)
            {
                printf("a");
                diff += 2;
            }
            else if (diff == 0)
                printf("x");
            else if (diff > 2)
            {
                printf("o");
                diff -= 4;
            }
            else
            {
                printf("z");
                diff -= 2;
            }
        }
    }
}