#include<stdio.h>
#include<string.h>
int main()
{
	int t,i,j,a,b,n,m,k,T;
	char s[101][101];
	scanf("%d",&t);
	while(t--)
	{
		scanf("%d%d",&n,&m);
		for(i=0;i<n;i++)
			scanf("%s",s[i]);
		scanf("%d",&T);
		while(T--)
		{
			scanf("%d%d%d",&a,&b,&k);
			if(s[a][b]+(k%26)>=97&&s[a][b]+(k%26)<=122)
			s[a][b]=s[a][b]+k%26;
			else if(s[a][b]+(k%26)<97)
				s[a][b]=s[a][b]+26+k%26;
			else if(s[a][b]+(k%26)>122)
				s[a][b]=s[a][b]-26+k%26;
		}
		for(i=0;i<n;i++)
			printf("%s\n",s[i]);
	}
	return 0;
}