#include <iostream>
#include <fstream>
#include <vector>

int mex(const std::vector<int>& myArray, int endIndex) {
    int mex = 0;
    int startIndex = 0;

    while (startIndex <= endIndex) {
        if (mex == myArray[startIndex]) {
            mex++;
            startIndex = 0;
        }
        else {
            startIndex++;
        }
    }

    return mex;
}

int main() {
    std::ifstream infile("prefmex.in");
    std::ofstream outfile("prefmex.out");

    int n;
    infile >> n;

    std::vector<int> tacos_sequence(n);
    for (int i = 0; i < n; i++) {
        infile >> tacos_sequence[i];
    }

    for (int i = 0; i < n; i++) {
        outfile << mex(tacos_sequence, i) << " ";
    }

    infile.close();
    outfile.close();

    return 0;
}