#include 
#include 
#include 
#include 
using namespace std;
int n, m;
vector> graph[105];
int dp[105][105][30][2];
// +INF -- max win
// -INF -- lucas win
int rec(int max_node, int lucas_node, int last_char, int turn) {
    if(dp[max_node][lucas_node][last_char][turn] != -1) {
        return dp[max_node][lucas_node][last_char][turn];
    }
    int result;
    if(turn == 0) {
        result = -(2e9);
        for(int i = 0; i < graph[max_node].size(); i++) {
            int neighbour = graph[max_node][i].first;
            int val = (int) graph[max_node][i].second;
            
            if(last_char <= val) {
                result = max(result, rec(neighbour, lucas_node, val, 1));
            }
        }
    }
    else {
        result = (2e9);
        for(int i = 0; i < graph[lucas_node].size(); i++) {
            int neighbour = graph[lucas_node][i].first;
            int val = (int) graph[lucas_node][i].second;
            
            if(last_char <= val) {
                result = min(result, rec(max_node, neighbour, val, 0));
            }
        }
    }
    return dp[max_node][lucas_node][last_char][turn] = result;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin >> n >> m;
    for(int i = 0; i < m; i++) {
        int a, b;
        char c;
        cin >> a >> b >> c;
        a--; b--;
        graph[a].push_back(make_pair(b, (c - 'a') + 1));
    }
    memset(dp, -1, sizeof dp);
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            if(rec(i, j, 0, 0) == 2e9) {
                cout << "A";
            }
            else {
                cout << "B";
            }
        }
        cout << endl;
    }
   return 0;
}