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#include<cstdio>
using namespace std;

int main()
{
    int n;
    char nr;

    int ones = 0, zeros = 0;

    scanf("%d", &n);
    for(int i = 0; i < 8*n; i++)
    {
        scanf(" %c", &nr);
        if(nr=='0')
            zeros++;
        else
            ones++;
    }
    ones-= n*3;
    zeros-=n*2;
    if(ones < 0 || zeros < 0)
        printf("NIE");
    else
    {
        while(ones >= 3 && n >= 1)
        {
            ones -= 3;
            n -= 1;
            printf("o");
        }
        if (ones == 2 && n >= 1)
        {
            ones -= 2;
            n -= 1;
            printf("y");
        }
        if (ones == 1 && n >= 1)
        {
            ones -= 1;
            n -= 1;
            printf("x");
        }
        for(int i = n; i > 0; i--)
            printf("a");
    }
}