#include <iostream>
using namespace std;
int n,m,q,arr[1000050];
char zm[1000050];
int main(){
	cin>>n>>m>>q;
	for(int i=1;i<=q;i++){
		int l,r;
		cin>>l>>r>>zm[i];
		arr[(l-1)*m+r]=i;
	}
	for(int i=n;i>=1;i--){
		for(int j=m;j>=1;j--){
			int k=(i-1)*m+j;
			if(i<n){
				arr[k]=max(arr[k],arr[k+m]);
			}
			if(j<m){
				arr[k]=max(arr[k],arr[k+1]);
			}
		}
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			int k=(i-1)*m+j;
			if(arr[k]==0){
				cout<<"A";
			}else{
				cout<<zm[arr[k]];
			}
		}
		cout<<"\n";
	}
	return 0;
}

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10 10 15
8 9 B
6 7 C
5 8 D
10 6 E
8 5 F
3 10 G
7 3 H
4 6 I
3 1 J
10 2 K
3 6 L
3 3 M
2 5 N
9 1 O
1 4 P