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#include <bits/stdc++.h>

using namespace std;

#define MIN 3
#define MAX 6

int main() {
    int n, count = 0;
    string s;
    scanf("%d\n", &n);
    
    for(int i = 0; i != (n << 3); ++i) {
        char c = getchar();
        count += c - '0';
    }    
    
    if(count > 6 * n || count < 3 * n) {
        printf("NIE\n");
        return 0;
    }

    while(n) {
        --n;
        if(count - 6 <= 6 * n && count - 6 >= 3 * n) {
            printf("o");
            count -= 6;
            continue;
        } else if(count - 3 <= 6 * n && count - 3 >= 3 * n) {
            printf("a");
            count -= 3;
            continue;
        } else if(count - 4 <= 6 * n && count - 4 >= 3 * n) {
            printf("c");
            count -= 4;
            continue;
        } else if(count - 5 <= 6 * n && count - 5 >= 3 * n) {
            printf("g");
            count -= 5;
            continue;
        }
    }
    printf("\n");
}