#include <bits/stdc++.h>

using namespace std;

ifstream fin("expresii2.in");
ofstream fout("expresii2.out");

typedef long long ll;
ll dp[35][35][35], n, m, p;
int sol[105], y;

int main()
{
    fin >> n >> m >> p;

    dp[0][1][0] = 1;
    for(int i = 0; i < n; ++i)
        for(int j = 0; j <= n; ++j)
            for(int k = 0; k < m + 3; ++k)
                if(dp[i][j][k] > 0)
                {
                    if(i + j + 1 <= n)
                        dp[i + 1][j][m + 2] += dp[i][j][k];
                    if(i + j + 2 <= n)
                        dp[i + 1][j + 1][m] += dp[i][j][k],
                        dp[i + 1][j + 1][m + 1] += dp[i][j][k];

                    if(j > 1 || (j == 1 && i == n - 1))
                       for(int lit = 0; lit < m; ++lit)
                            dp[i + 1][j - 1][lit] += dp[i][j][k];
                }
    ll rez = 0;
    for(int j = 0; j < m + 2; ++j)
        rez += dp[n][0][j];

    fout << rez << '\n';
    for(int i = n; i >= 1; --i)
        for(int j = 0; j < m + 3; ++j)
            if(dp[i][y][j] < p)
                p -= dp[i][y][j];
            else {
                sol[n - i + 1] = j;
                if(j < m)
                    ++y;
                else y -= (j < m + 2);
                break;
            }

    for(int i = 1; i <= n; ++i)
        if(sol[i] < m)
            fout << (char)(sol[i] + 'A');
        else if(sol[i] == m)
            fout << "+";
        else if(sol[i] == m + 1)
            fout << "*";
        else fout << "!";
    return 0;
}