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#include <cstdio>
#include <iostream>

int main() {

    int n;
    scanf("%d", &n);

    char* tab = "000acgo";

    int bits = 0;
    char c;
    while (scanf("%c", &c) == 1)
        if (c == '1') ++bits;

    if ((bits < (n * 3)) || ((n * 6) < bits)) {
        puts("NIE");
        return 0;
    }

    while (bits > 0) {
        int q = bits / n;
        printf("%c", tab[q]);
        bits -= q;
        n -= 1;
    }
    printf("\n");

    return 0;
}