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#include <iostream>

int main(){
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);

    int n;
    int diff = 0;

    std::cin >> n;

    char c;

    for(int i = 0; i < 8*n; i++){
        std::cin >> c;
        diff += ((c == '1') ? 1 : -1);
    }

    if(diff > 4*n){
        std::cout << "NIE";
        return 0;
    }

    if(diff < -2*n){
        std::cout << "NIE";
        return 0;
    }

    int i = 0;

    if(diff > 0){
        while(diff >= 4){
            std::cout << 'o';
            diff -= 4;
            i++;
        }
        while(diff >= 2){
            std::cout << 'n';
            diff -= 2;
            i++;
        }
    } else if(diff < 0){
        while(diff <= -2){
            std::cout << 'a';
            diff += 2;
            i++;
        }
    }
    while(i < n){
        std::cout << 'q';
        i++;
    }
    


    return 0;
}