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#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    string input;
    cin >> input;
    int onesCount = 0;
    for(int i = 0; i < input.size(); ++i){
        if(input[i] == '1'){
            ++onesCount;
        }
    }
    if(onesCount < n * 3 || onesCount > n * 6){
        cout << "NIE\n";
        return 0;
    }
    string s(n, 'a');
    onesCount -= n * 3;
    int iter = 0;
    while(onesCount >= 3){
        s[iter] = 'w';
        onesCount -= 3;
        ++iter;
    }
    if(onesCount == 2){
        s[iter] = 'v';
        ++iter;
        onesCount -= 2;
    }
    if(onesCount == 1){
        s[iter] = 't';
        ++iter;
        onesCount -= 1;
    }
    cout << s << '\n';

    return 0;
}