求助（玄关）！听取WA声一片！！

#include<bits/stdc++.h>
using namespace std;
const int N=1e3+10;
char photo[N][N]={0};
int n,m,k;
struct four{
	int a,b;
	char c,d;
}o[N];
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>n>>m>>k;
	for(int i=1;i<=k;i++){
		cin>>o[i].a>>o[i].b>>o[i].c>>o[i].d;
		if(o[i].d=='R'){
			while(o[i].b<=m){
				photo[o[i].a][o[i].b]=o[i].c;
				o[i].b++;
			}
		}
		if(o[i].d=='U'){
			while(o[i].a>=1){
				photo[o[i].a][o[i].b]=o[i].c;
				o[i].a--;
			}
		}
		if(o[i].d=='D'){
			while(o[i].a<=n){
				photo[o[i].a][o[i].b]=o[i].c;
				o[i].a++;
			}
		}
		if(o[i].d=='L'){
			while(o[i].b>=1){
				photo[o[i].a][o[i].b]=o[i].c;
				o[i].b--;
			}
		}
	}
	for(int i=1;i<=n;i++){
		cout<<endl;
		for(int j=1;j<=m;j++){
			if(photo[i][j]==0) cout<<".";
			else cout<<photo[i][j];
		}
	}
	return 0;
}