#include <iostream>
#include <vector>
#include <algorithm>
#define ll long long

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    ll n, m, q;
    cin >> n >> m >> q;
    
    vector<pair<pair<ll, ll>, char>> qs;
    for (ll i = 0; i < q; i++) {
        ll a, b;
        cin >> a >> b;
        char ch;
        cin >> ch;
        qs.push_back({{a, b}, ch});
    }
    reverse(qs.begin(), qs.end());
    
    vector<vector<char>> ans(n, vector<char>(m, ' '));
    for (pair<pair<ll, ll>, ll> p : qs) {
        ll i = p.first.first;
        ll j = p.first.second;
        char ch = p.second;
        for (ll ii = i - 1; ii >= 0; ii--) {
            if (ans[ii][j - 1] != ' ') break;
            for (ll jj = j - 1; jj >= 0; jj--) {
                if (ans[ii][jj] == ' ') ans[ii][jj] = ch;
                else break;
            }
        }
    }
    
    for (ll i = 0; i < n; i++) {
        for (ll j = 0; j < m; j++) {
            if (ans[i][j] == ' ') cout << 'A';
            else cout << ans[i][j];
        }
        cout << '\n';
    }
}