#include <stdlib.h>
#include <stdio.h>

int main(int argc, char** argv)
{
	int x,y,n,i,j,sum, row, col;
	int rows[20001];
	int cols[20001];
	int diag[40000];
	int adiag[40000];
		
	while(1) {
		sum = 0;
		
		scanf("%i %i %i",&x, &y, &n);
		if(n==0 && x==0 && y==0)break;
		if(n==0)
		{
			printf("%d\n",x*y);
		}
		
		for(i = 0; i < 20001; i++)
		{
			rows[i] = 0;
			cols[i] = 0;
		}
		
		for(i = 0; i < 40000; i++)
		{
			diag[i] = 0;
			adiag[i] = 0;
		}
				
		for(i = 0; i < n; i++)
		{
			scanf("%i %i",&col, &row);
			cols[col] = 1;
			rows[row] = 1;
			diag[col+row-1] = 1;
			adiag[x-col+row] = 1;
			
			//printf("d1=%i d2=%i\n",col+row-1,x-col+row);
			
		}
		
		for(i = 1; i <= x; i++)
		{
			if(cols[i]==1)continue;
			
			for(j = 1; j <= y; j++)
			{
				if(rows[j]==1)continue;
				
				if(diag[i+j-1]==0 && adiag[x-i+j]==0){
					printf("%i %i\n",i,j);
					sum++;
				}
			}
		}
		
		
	}
	return 0;
}